Database Develop

[Q] Tabhost and fragments/activities

Hello,
I'm trying to create an app with some tabs that link to different activities, I was able to do that with tabhost and normal buttons with onClick=startActivity, but I had some problems losing the scrollbar position from tabs on every activity change.
Well, now I was reading about fragments, and its really interesting. i created the app with the codes below, I can click in every tab and I can see the content (just watched one tutorial with that), but I cant figure out how could I open one different activity in the FrameLayout when I click in each tab. I see that the code gets the tabs id and then uses it to create one text, what I cant figure out is how to verify if the ID is "X", it would open the "activity2", "....3", "....4", "...n". I tried to put some IFs inside it, but nothing worked.
Is there a way to do that ? This an ideal way of doing that or should I change something to make it easier and better ?
activity_main.xml
Code:
<android.support.v4.app.FragmentTabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/horizontalScrollView"
android:scrollbars="none"
android:scrollbarSize="0dp">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"/>
</HorizontalScrollView>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
MainActivity.java
Code:
package com.example.tbarata.myapplication;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
public class MainActivity extends FragmentActivity {
private FragmentTabHost mTabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);
mTabHost.addTab(
mTabHost.newTabSpec("tab1").setIndicator("Tab 1111", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab2").setIndicator("Tab 2222", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab3").setIndicator("Tab 3333", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab44").setIndicator("Tab 44", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab5").setIndicator("Tab 55", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab6").setIndicator("Tab 66", null),
FragmentTab.class, null);
}
}
activity_fragment_layout.xml
Code:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
android:background="#eaecee">
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical|center_horizontal"
android:text="@string/hello_world"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
FragmentTab.java
Code:
package com.example.tbarata.myapplication;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class FragmentTab extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_fragment_layout, container, false);
TextView tv = (TextView) v.findViewById(R.id.text);
tv.setText(this.getTag() + " Content");
return v;
}
}
Thanks very much!
barata

Plz, could anyone give me some light, or just some link of a tutorial ? Could be even in japanese
I was able to load one activity here comparing the tab id and loading the activity, but when I did that, the tabHost was deleted, so I repeat all the tabHost lines in this second activity, and I can see when I click in its tab its loaded, but the app crashes
Here is the code I've changed:
fragmentTab.java - Just to check the tab id and then load the activity, with only this worked great, but no tabs in the second activity
Code:
if (this.getTag() == "tab2") {
Intent intent = new Intent(getActivity(), fragment_layout2.class);
startActivity(intent);
}
} else {
TextView tv = (TextView) v.findViewById(R.id.text);
tv.setText(this.getTag() + " Content");
}
So in the fragment_layout2.java I repeated the codes to show the tabs, but when I click in this tab2 the app crashes:
Code:
public class fragment_layout2 extends FragmentActivity {
private FragmentTabHost mTabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment_layout2);
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);
mTabHost.addTab(
mTabHost.newTabSpec("tab1").setIndicator("Tab 1111", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab2").setIndicator("Tab 2222", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab3").setIndicator("Tab 3333", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab44").setIndicator("Tab 44", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab5").setIndicator("Tab 55", null),
FragmentTab.class, null);
mTabHost.addTab(
mTabHost.newTabSpec("tab6").setIndicator("Tab 66", null),
FragmentTab.class, null);
}
Thanks.
Barata

App gets force closed

SplashAcvtivity.java File
Code:
package com[.]nijinsha.didyouknow;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.os.Handler;
/**
* Created by Digit on 3/17/2016.
*/
public class SplashActivity extends AppCompatActivity {
// Splash screen timer
private static int SPLASH_TIME_OUT = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
new Handler().postDelayed(new Runnable() {
/*
* Showing splash screen with a timer. This will be useful when you
* want to show case your app logo / company
*/
@Override
public void run() {
// This method will be executed once the timer is over
// Start your app main activity
Intent i = new Intent(SplashActivity.this, MainActivity.class);
startActivity(i);
// close this activity
finish();
}
}, SPLASH_TIME_OUT);
}
Manifest.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest
package="com.nijinsha.didyouknow">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true">
<activity
android:name=".SplashActivity"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.Black.NoTitleBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:theme="@style/Theme.AppCompat.DayNight.NoActionBar"
android:name=".MainActivity"
android:configChanges="keyboardHidden|orientation|screenSize">
</activity>
</application>
</manifest>
LOG FILE
03-17 14:53:21.490 7053-7053/com.nijinsha.didyouknow E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nijinsha.didyouknow, PID: 7053
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nijinsha.didyouknow/com.nijinsha.didyouknow.SplashActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2378)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5433)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:340)
at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:309)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:273)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.nijinsha.didyouknow.SplashActivity.onCreate(SplashActivity.java:21)
at android.app.Activity.performCreate(Activity.java:5301)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2291)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2378)*
at android.app.ActivityThread.access$800(ActivityThread.java:155)*
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)*
at android.os.Handler.dispatchMessage(Handler.java:102)*
at android.os.Looper.loop(Looper.java:136)*
at android.app.ActivityThread.main(ActivityThread.java:5433)*
at java.lang.reflect.Method.invokeNative(Native Method)*
at java.lang.reflect.Method.invoke(Method.java:515)*

This line
Code:
at com.nijinsha.didyouknow.SplashActivity.onCreate(Sp lashActivity.java:21)
suggest that app crash in:
Code:
setContentView(R.layout.activity_splash);
Your activity extends AppCompatActivity, but in manifest You declared for this activity:
Code:
android:theme="@android:style/Theme.Black.NoTitleBar" >
You need to use another theme for this acitivty.

You must use AppCompat themes with activity that extended from AppCompatActivity class,
Code:
android:theme="@android:style/Theme.AppCompat.Light"
or don't extend your activity from AppCompatActivity.
Code:
public class SplashActivity extends Activity

How to make an activity to open a url

Hello! I dont know much about coding so i decided to buy an app about quotes. The thing is i have opened it in android studio and want to make some changes. Specifically i want i want to change the button ''authors'' and instead of opening an activity i want to open a web link. How i am supposed to do that?
I hope this bit of code helps :
I think the button i want to change is this in the android manifest
<activity
android:name="com.axdev.quotes.AuteursActivity"
android:label="@string/title_activity_auteurs"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<!-- Points to searchable activity -->
<meta-data android:name="android.app.default_searchable"
android:value=".AuteursActivity" />
<!-- Points to searchable meta data -->
<meta-data android:name="android.app.searchable"
android:resource="@xml/searchable"/>
</activity>

Hi!
Code:
author_button.setOnClickListener(buttonClick);
private View.OnClickListener buttonClick = new View.OnClickListener(){
public void onClick(View v){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.addCategory(Intent.CATEGORY_BROWSABLE);
intent.setData(Uri.parse("your link"));
startActivity(intent);
}
};

Where to put code
Ducktamine said:
Hi!
Code:
author_button.setOnClickListener(buttonClick);
private View.OnClickListener buttonClick = new View.OnClickListener(){
public void onClick(View v){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.addCategory(Intent.CATEGORY_BROWSABLE);
intent.setData(Uri.parse("your link"));
startActivity(intent);
}
};
Click to expand...
Click to collapse
Thank you very much for your reply! Where do i have to put this code? In the android manifest? Also do i have to replace something first?

Looks like it should be in com.axdev.quotes.AuteursActivity, just find the place where click listener for button ''authors'' is setted. And replace code of listener.

Button
I cant find it. Here is th code
public class AuteursActivity extends ActionBarActivity {
private ArrayList<Quote> imageArry = new ArrayList<Quote>();
private AuthorsListAdapter adapter;
private DataBaseHandler db;
private ListView dataList;
SearchView searchView;
private AdView adView;
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_auteurs);
final ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(getResources().getColor(R.color.colorPrimaryDark));
}
db = new DataBaseHandler(this);
List<Quote> authors = db.getAllAuthors("");
for (Quote cn : authors) {
imageArry.add(cn);
}
adapter = new AuthorsListAdapter(this, R.layout.author_items, imageArry);
dataList = (ListView) findViewById(R.id.listView1);
dataList.setAdapter(adapter);
dataList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@override
public void onItemClick(AdapterView<?> parent, View viewClicked,
int position, long idInDB) {
Quote srr = imageArry.get(position);
Intent i = new Intent(getApplicationContext(),
QuotesActivity.class);
i.putExtra("name", srr.getName());
i.putExtra("mode", "isAuthor");
startActivity(i);
}
});

Here it is:
Code:
@override
public void onItemClick(AdapterView<?> parent, View viewClicked,
int position, long idInDB) {
Quote srr = imageArry.get(position);
Intent i = new Intent(getApplicationContext(),
QuotesActivity.class);
i.putExtra("name", srr.getName());
i.putExtra("mode", "isAuthor");
startActivity(i);
}
});

cant build apk
Thank you! I made the changes but when i go to build the apk it gives the following errors
error: <identifier> expected
error: <identifier> expected
error: <;> expected
error: <identifier> expected
error: <identifier> expected

nickblu said:
Thank you! I made the changes but when i go to build the apk it gives the following errors
error: <identifier> expected
error: <identifier> expected
error: <;> expected
error: <identifier> expected
error: <identifier> expected
Click to expand...
Click to collapse
looks like errors in your syntax.
I strongly recommend to pick some basics skills in programming, study java and android development, if you really want to make good app by yourself.

app doesn't lanch; java.lang.NullPointerException

Hello,
i am trying to launch my app on a samsung galaxy s3, but the activity doesn't launch
can someone help me?
error:
06-14 08:36:58.720 24601-24601/plopmenzinc.nsapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: plopmenzinc.nsapp, PID: 24601
java.lang.RuntimeException: Unable to start activity ComponentInfo{plopmenzinc.nsapp/plopmenzinc.nsapp.Start}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2436)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2495)
at android.app.ActivityThread.access$900(ActivityThread.java:170)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5635)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at plopmenzinc.nsapp.Start.onCreate(Start.java:37)
at android.app.Activity.performCreate(Activity.java:5580)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2400)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2495)*
at android.app.ActivityThread.access$900(ActivityThread.java:170)*
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)*
at android.os.Handler.dispatchMessage(Handler.java:102)*
at android.os.Looper.loop(Looper.java:146)*
at android.app.ActivityThread.main(ActivityThread.java:5635)*
at java.lang.reflect.Method.invokeNative(Native Method)*
at java.lang.reflect.Method.invoke(Method.java:515)*
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)*
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)*
at dalvik.system.NativeStart.main(Native Method)*
start.java:
package plopmenzinc.nsapp;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.nfc.NfcAdapter;
import android.os.CountDownTimer;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageSwitcher;
import android.widget.TextView;
import android.widget.Toast;
public class Start extends AppCompatActivity {
int number = 0;
private ImageSwitcher sw;
public static final String MIME_TEXT_PLAIN = "text/plain";
public static final String TAG = "NfcDemo";
private TextView mTextView;
private NfcAdapter mNfcAdapter;
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
sw.setImageResource(R.drawable.reclame);
if (mNfcAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(this, "U kunt deze functie helaas niet gebruiken, omdat uw toestel geen NFC heeft.", Toast.LENGTH_LONG).show();
finish();
return;
}
if (!mNfcAdapter.isEnabled()) {
mTextView.setText("Om deze functie te gebruiken moet u NFC aanzetten.");
}
handleIntent(getIntent());
}
@override
protected void onResume() {
super.onResume();
/**
* It's important, that the activity is in the foreground (resumed). Otherwise
* an IllegalStateException is thrown.
*/
setupForegroundDispatch(this, mNfcAdapter);
}
@override
protected void onPause() {
/**
* Call this before onPause, otherwise an IllegalArgumentException is thrown as well.
*/
stopForegroundDispatch(this, mNfcAdapter);
super.onPause();
}
@override
protected void onNewIntent(Intent intent) {
/**
* This method gets called, when a new Intent gets associated with the current activity instance.
* Instead of creating a new activity, onNewIntent will be called. For more information have a look
* at the documentation.
*
* In our case this method gets called, when the user attaches a Tag to the device.
*/
handleIntent(intent);
}
private void handleIntent(Intent intent) {
TextView var = (TextView) findViewById(R.id.score);
number++;
String disp = Integer.toString(number);
var.setText(disp);
final TextView CountDown = (TextView) findViewById(R.id.textView3);
new CountDownTimer(300000, 1000) {
public void onTick(long millisUntilFinished) {
CountDown.setText(millisUntilFinished / 1000 + " sec");
}
public void onFinish() {
CountDown.setText("0 sec");
}
}.start();
}
/**
* @param activity The corresponding {@link Activity} requesting the foreground dispatch.
* @param adapter The {@link NfcAdapter} used for the foreground dispatch.
*/
public void setupForegroundDispatch(final Activity activity, NfcAdapter adapter) {
final Intent intent = new Intent(activity.getApplicationContext(), activity.getClass());
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
final PendingIntent pendingIntent = PendingIntent.getActivity(activity.getApplicationContext(), 0, intent, 0);
IntentFilter[] filters = new IntentFilter[1];
String[][] techList = new String[][]{};
// Notice that this is the same filter as in our manifest.
filters[0] = new IntentFilter();
filters[0].addAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
filters[0].addCategory(Intent.CATEGORY_DEFAULT);
try {
filters[0].addDataType(MIME_TEXT_PLAIN);
} catch (IntentFilter.MalformedMimeTypeException e) {
throw new RuntimeException("Check your mime type.");
}
adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
}
public void stopForegroundDispatch(final Activity activity, NfcAdapter adapter) {
adapter.disableForegroundDispatch(activity);
}
public void image_next(){
sw.setImageResource(R.drawable.reclame);
}
public void image_prev(){
sw.setImageResource(R.drawable.reclame2);
}
}
activity:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="(link)"
xmlns:tools="(link)"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
androidrientation="vertical"
androidaddingBottom="@dimen/activity_vertical_margin"
androidaddingLeft="@dimen/activity_horizontal_margin"
androidaddingRight="@dimen/activity_horizontal_margin"
androidaddingTop="@dimen/activity_vertical_margin"
tools:context="plopmenzinc.nsapp.Start"
android:saveEnabled="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Uw aantal punten:"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="50dp"
android:singleLine="true"
android:textColor="#FF2646B0"
android:textSize="22sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/disp"
android:id="@+id/score"
android:layout_alignBottom="@+id/textView"
android:layout_toRightOf="@+id/textView"
android:layout_toEndOf="@+id/textView"
android:textSize="22sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tijd tot U weer kunt scannen:"
android:id="@+id/textView2"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="34dp"
android:singleLine="true"
android:textColor="#FF2646B0"
android:textSize="22sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0 sec"
android:id="@+id/textView3"
android:singleLine="true"
android:textSize="22sp"
android:layout_alignTop="@+id/textView2"
android:layout_toRightOf="@+id/textView2"
android:layout_toEndOf="@+id/textView2" />
<ImageSwitcher
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageSwitcher"
android:layout_below="@+id/textView"
android:layout_centerHorizontal="true"
android:layout_marginTop="275dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="prev"
android:id="@+id/button"
android:layout_alignTop="@+id/button2"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="54dp"
android:layout_marginStart="54dp"
androidnClick="image_prev" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="next"
android:id="@+id/button2"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/textView3"
android:layout_alignEnd="@+id/textView3"
androidnClick="image_next" />
</RelativeLayout>
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="(link)"
package="plopmenzinc.nsapp">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".Start">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.NFC" />
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
<activity
android:name="net.vrallev.android.nfc.demo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED" />
</intent-filter>
<meta-data
android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="@xml/nfc_tech_filter" />
</activity>
</manifest>
need to get this finished before thursday, so please help me

Well, thus far I see that you are making references to parts of the Layout View but I am not seeing where you are declaring your TextView / ImageView inside your XML layout, see below:
Code:
sw.setImageResource(R.drawable.reclame);
mTextView.setText("Om deze functie te gebruiken moet u NFC aanzetten.");
You need to have something like:
mTextView = (TextView)findViewbyId(R.id.TextViewId);
sw = (ImageView)findViewById(R.id.ImageViewId);
Fix those, try again and then return.

Widget Show Other App's Icon

I'm trying to create a widget that will show the icon's of some app's installed on the device.
I manage to get a list of packages installed in the device, but i don't know how to get the icon from these.
I have this in my activity:
Code:
final static List<String> pacote_app = new ArrayList<String>();
final List<ApplicationInfo> apps = pm.getInstalledApplications(0);
for (ApplicationInfo app : apps) {
//checks for flags; if flagged, check if updated system app
if ((app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0) {
// installedApps.add(app);
//it's a system app, not interested
} else if ((app.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
//Discard this one
//in this case, it should be a user-installed app
} else {
String pacote = (String) app.packageName; //NOME DOS PACOTES
pacote_app.add(pacote);
}
}
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
WidgetViewsFactory
Code:
import static com.example.magcr23.mywidget.LoremActivity.pacote_app;
public class WidgetViewsFactory implements RemoteViewsService.RemoteViewsFactory {
Context context;
private Context ctxt=null;
private int appWidgetId;
public WidgetViewsFactory(Context ctxt, Intent intent) {
this.ctxt=ctxt;
appWidgetId=intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
@Override
public void onCreate() {}
@Override
public void onDestroy() {
// no-op
}
@Override
public int getCount() {
return(pacote_app.size());
}
@Override
public RemoteViews getViewAt(int position) {
RemoteViews row=new RemoteViews(ctxt.getPackageName(),
R.layout.list_item);
//FILL LIST
row.setTextViewText(android.R.id.text1, pacote_app.get(position));
//SEND WORD TO ACTIVITY
Intent i=new Intent();
Bundle extras=new Bundle();
extras.putString(WidgetProvider.EXTRA_WORD, pacote_app.get(position));
i.putExtras(extras);
row.setOnClickFillInIntent(android.R.id.text1, i);
//--------------
return(row);
}
@Override
public RemoteViews getLoadingView() {
return(null);
}
@Override
public int getViewTypeCount() {
return(1);
}
@Override
public long getItemId(int position) {
return(position);
}
@Override
public boolean hasStableIds() {
return(true);
}
@Override
public void onDataSetChanged() {
// no-op
}
}
WidgetProvider
Code:
public class WidgetProvider extends AppWidgetProvider{
public static String EXTRA_WORD=
"com.commonsware.android.appwidget.lorem.WORD";
@Override
public void onUpdate(Context ctxt, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
for (int i=0; i<appWidgetIds.length; i++) {
Intent svcIntent=new Intent(ctxt, WidgetService.class);
svcIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);
svcIntent.setData(Uri.parse(svcIntent.toUri(Intent.URI_INTENT_SCHEME)));
RemoteViews widget=new RemoteViews(ctxt.getPackageName(),
R.layout.novo_widget);
widget.setRemoteAdapter(appWidgetIds[i], R.id.listagem,
svcIntent);
Intent clickIntent=new Intent(ctxt, LoremActivity.class);
PendingIntent clickPI=PendingIntent
.getActivity(ctxt, 0,
clickIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
widget.setPendingIntentTemplate(R.id.listagem, clickPI);
appWidgetManager.updateAppWidget(appWidgetIds[i], widget);
}
super.onUpdate(ctxt, appWidgetManager, appWidgetIds);
}
}
WidgetService
Code:
public class WidgetService extends RemoteViewsService {
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
return(new WidgetViewsFactory(this.getApplicationContext(),
intent));
}
Layout
Code:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="@dimen/widget_margin"
android:orientation="horizontal">
<ListView
android:id="@+id/listagem"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
ListView Layout
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:gravity="center_vertical"
android:paddingLeft="6dip"
android:minHeight="?android:attr/listPreferredItemHeight"
android:textColor="#000"
/>
</LinearLayout>

(Whoops, topic a bit old, haven't see the date)
Hi,
You should give a look to PackageItemInfo methods, especially loadIcon (https://developer.android.com/refer...ml#loadIcon(android.content.pm.PackageManager)
In your code:
Code:
final static List<String> pacote_app = new ArrayList<String>();
final List<ApplicationInfo> apps = pm.getInstalledApplications(0);
for (ApplicationInfo app : apps) {
//checks for flags; if flagged, check if updated system app
if ((app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0) {
// installedApps.add(app);
//it's a system app, not interested
} else if ((app.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
//Discard this one
//in this case, it should be a user-installed app
} else {
String pacote = (String) app.packageName; //NOME DOS PACOTES
pacote_app.add(pacote);
// I guess you want to get your icon here
Drawable packageIcon = app.loadIcon(pm);
}
}
To show it, the easiest might be to add an ImageView and call setImageDrawable
Good luck!