Database Develop

Please help with Java homework!!!

Okay here's the thing:
I have an assignment in Java class that's due in 1.5 hours and figured that this would be the best place to ask since you guys are (hopefully) good at this kind of stuff.
Here's the code:
/**
* Exercise 3.
*
* Complete the setBalances method below to set all accounts in an array to the specified value.
*
* The test methods should pass.
*
*/
public class AccountMethods {
public static void main(String[] args) {
Account[] accounts = {new Account(100, "joe"),
new Account(200, "jane"),
new Account(300, "jerry")};
testSetBalances(accounts, 50);
testBalanceNonNegative();
}
public static void setBalances(Account[] accounts, double value) {
double balance = 0;
for (int i = 0; i < accounts.length; i++) {
balance += accounts.getBalance();
}
}
public static boolean testSetBalances(Account[] accounts, double value) {
setBalances(accounts, value);
for (int i = 0; i < accounts.length; i++) {
if (accounts.getBalance() != value) {
System.out.println("testSetBalances fails on element " + i);
return false;
}
}
System.out.println("testSetBalances passes.");
return true;
}
public static boolean testBalanceNonNegative() {
Account a = new Account(100, "jim");
a.setBalance(-100);
if (a.getBalance() < 0) {
System.out.println("testBalanceNonNegtaive fails");
return false;
} else {
System.out.println("testBalanceNonNegative passes.");
return true;
}
}
}
The bold part is what I'm suppose to be working with, but I can't get it to pass in the testSetBalances method. I don't know if I'm explaining this right, but when I'm compiling the code, it's suppose to say:
testSetBalances passes
But instead, it's saying: testSetBalances fails on element 0
Don't worry about the other parts of the code because the assignment for that is done already.

[Q] how to hook bluetooth getDefaultAdapter

how to hook bluetooth getDefaultAdapter, i tried many times, but i can't hook it
please help me on it, thanks!
public static synchronized BluetoothAdapter getDefaultAdapter() {
378 if (sAdapter == null) {
379 IBinder b = ServiceManager.getService(BLUETOOTH_MANAGER_SERVIC E);
380 if (b != null) {
381 IBluetoothManager managerService = IBluetoothManager.Stub.asInterface(b);
382 sAdapter = new BluetoothAdapter(managerService);
383 } else {
384 Log.e(TAG, "Bluetooth binder is null");
385 }
386 }
387 return sAdapter;
388 }

fengfengchao said:
how to hook bluetooth getDefaultAdapter, i tried many times, but i can't hook it
please help me on it, thanks!
public static synchronized BluetoothAdapter getDefaultAdapter() {
378 if (sAdapter == null) {
379 IBinder b = ServiceManager.getService(BLUETOOTH_MANAGER_SERVIC E);
380 if (b != null) {
381 IBluetoothManager managerService = IBluetoothManager.Stub.asInterface(b);
382 sAdapter = new BluetoothAdapter(managerService);
383 } else {
384 Log.e(TAG, "Bluetooth binder is null");
385 }
386 }
387 return sAdapter;
388 }
Click to expand...
Click to collapse
Can you post your xposed log?

fengfengchao said:
how to hook bluetooth getDefaultAdapter, i tried many times, but i can't hook it
please help me on it, thanks!
public static synchronized BluetoothAdapter getDefaultAdapter() {
378 if (sAdapter == null) {
379 IBinder b = ServiceManager.getService(BLUETOOTH_MANAGER_SERVIC E);
380 if (b != null) {
381 IBluetoothManager managerService = IBluetoothManager.Stub.asInterface(b);
382 sAdapter = new BluetoothAdapter(managerService);
383 } else {
384 Log.e(TAG, "Bluetooth binder is null");
385 }
386 }
387 return sAdapter;
388 }
Click to expand...
Click to collapse
You should post your code which shows how you are trying to hook that method.
Without it, we can only guess.

[Help] Bluetooth app

Hi!
I have some problems with my bluetooth app. I made the setup for a bluetooth server on a Raspberry Pi and I was able to send data to it with my app, but I don't know how to receive data from the server. The server works properly, I tried with the BlueTerm 2 app and I can receive data from it. Can someone help me to implement the receiver in my app?
My code below:
Code:
package com.example.bluetooth1;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.UUID;
import com.example.bluetooth1.R;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";
Button btnOn, btnOff;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("94f39d29-7d6d-437d-973b-fba39e49d4ee");
// MAC-address of Bluetooth module (you must edit this line)
private static String address = "00:1A:7D:DA:71:14";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnOn = (Button) findViewById(R.id.btnOn);
btnOff = (Button) findViewById(R.id.btnOff);
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();
btnOn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("esti un prost");
//Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
}
});
btnOff.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sendData("cel mai prost");
// Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
}
});
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
if(Build.VERSION.SDK_INT >= 10){
try {
final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
return (BluetoothSocket) m.invoke(device, MY_UUID);
} catch (Exception e) {
Log.e(TAG, "Could not create Insecure RFComm Connection",e);
}
}
return device.createRfcommSocketToServiceRecord(MY_UUID);
}
@Override
public void onResume() {
super.onResume();
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e1) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
}
btAdapter.cancelDiscovery();
try {
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
}
}
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth not support");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth ON...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
}
private void errorExit(String title, String message){
Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
finish();
}
private void sendData(String message) {
byte[] msgBuffer = message.getBytes();
try {
outStream.write(msgBuffer);
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
errorExit("Fatal Error", msg);
}
}
}

Black screen and app shutdown when trying to go back to the previous activity/view

When i run my script below everything works fine. When i want to go back to the previous activity i get a black screen on the emulator and then the app shuts down, i also get a black screen when i exit the application and try to resume it.
The script:
Code:
package com.example.bono.as3;
import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
import java.io.InputStream;
public class Main extends Activity {
DrawView drawView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
drawView = new DrawView(this);
setContentView(drawView);
}
@Override public void onResume(){
super.onResume();
drawView.resume();
}
@Override public void onPause(){
super.onPause();
drawView.pause();
}
public class DrawView extends SurfaceView implements Runnable{
Thread gameloop = new Thread();
SurfaceHolder surface;
volatile boolean running = false;
AssetManager assets = null;
BitmapFactory.Options options = null;
Bitmap incect[];
int frame = 0;
public DrawView(Context context){
super(context);
surface = getHolder();
assets = context.getAssets();
options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
incect = new Bitmap[2];
try {
for (int n = 0; n < incect.length; n++){
String filename = "incect"+Integer.toString(n+1)+".png";
InputStream istream = assets.open(filename);
incect[n] = BitmapFactory.decodeStream(istream,null,options);
istream.close();
}
} catch (IOException e){
e.printStackTrace();
}
}
public void resume(){
running = true;
gameloop = new Thread(this);
gameloop.start();
}
public void pause(){
running = false;
while (true){
try {
gameloop.join();
}
catch (InterruptedException e){}
}
}
@Override public void run (){
while (running){
if (!surface.getSurface().isValid())
continue;
Canvas canvas = surface.lockCanvas();
canvas.drawColor(Color.rgb(85, 107, 47));
canvas.drawBitmap(incect[frame], 0, 0, null);
surface.unlockCanvasAndPost(canvas);
frame++;
if (frame > 1) frame = 0;
try {
Thread.sleep(500);
} catch (InterruptedException e){
e.printStackTrace();
}
}
}
}
}
I dont get any error message in the log, what i do get is about 13 messages saying "suspending all threads took: X ms" so it has something to the with my gameloop Thread i think. Unfortunately i dont see what the problem is in my code... Can anyone help me with this?

Listview filtering and getting right onclickitem

I need help for filtering a listview and open a new activity from the filtered list view onItemClick. The problem is I get the filtered view right but I do not know how to store the ID from JSON for each post.
Problem I am facing: When I click the list item when it is not yet filtered it passes the correct ID for the selected list item. But when I try to filter it, it is showing wrong data (data of another item) in the next activity.
What I am trying to achieve: to show a list of titles in a listview which can be filtered with an edit text box. when I click on any list item (if it is filtered or not) it will pass the ID of that respective item to the next activity.
The Main Fragment - From where I am fetching JSON data and listing it in a listview and filtering the data with edit text.
Code:
public class EnglishHomeSearchFragment extends Fragment {
String url = "MYJSONURL/posts?categories=4&fields=id,title";
List list;
Gson gson;
ProgressBar progressBar;
ListView postList;
Map < String, Object > mapPost;
Map < String, Object > mapTitle;
int postID;
String postTitle[];
EditText editText;
private ArrayAdapter adapter;
private View rootView;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.search_englishhome, container, false);
if (!isConnected(getActivity())) buildDialog(getActivity()).show();
else {
postList = (ListView) rootView.findViewById(R.id.postList);
progressBar = (ProgressBar) rootView.findViewById(R.id.progressBar);
progressBar.setVisibility(View.VISIBLE);
initlist();
editText = (EditText) rootView.findViewById(R.id.inputsearchenglishhome);
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence cs, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
System.out.println("Text[" + s + "]");
adapter.getFilter().filter(s.toString());
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
return rootView;
}
private void initlist() {
StringRequest request = new StringRequest(Request.Method.GET, url, new Response.Listener < String > () {
@Override
public void onResponse(String s) {
gson = new Gson();
list = (List) gson.fromJson(s, List.class);
postTitle = new String[list.size()];
for (int i = 0; i < list.size(); ++i) {
mapPost = (Map < String, Object > ) list.get(i);
mapTitle = (Map < String, Object > ) mapPost.get("title");
postTitle[i] = (String) mapTitle.get("rendered");
}
adapter = new ArrayAdapter < > (Objects.requireNonNull(getActivity()), android.R.layout.simple_list_item_1, postTitle);
postList.setAdapter(adapter);
progressBar.setVisibility(View.GONE);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(getActivity(), "Error! Check your Internet Connection.", Toast.LENGTH_LONG).show();
}
});
RequestQueue rQueue = Volley.newRequestQueue(rootView.getContext());
rQueue.add(request);
postList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView << ? > parent, View view, int position, long id) {
mapPost = (Map < String, Object > ) list.get(position);
postID = ((Double) mapPost.get("id")).intValue();
Intent intent = new Intent(getActivity(), EnglishPost.class);
intent.putExtra("id", "" + postID);
startActivity(intent);
}
});
}
public boolean isConnected(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netinfo = Objects.requireNonNull(cm).getActiveNetworkInfo();
if (netinfo != null && netinfo.isConnectedOrConnecting()) {
android.net.NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
return (mobile != null && mobile.isConnectedOrConnecting()) || (wifi != null && wifi.isConnectedOrConnecting());
} else return false;
}
public AlertDialog.Builder buildDialog(Context c) {
AlertDialog.Builder builder = new AlertDialog.Builder(c);
builder.setTitle("No Internet connection.");
builder.setMessage("You are not connected to the Internet.");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
return builder;
}
}
I have asked for help in several help forums. But no one helped me yet. I am new to Android app development. Please help me to resolve this issue without changing the whole code. Thank you in advance.
My JSON data looks like this:
Code:
[
{
id: 543,
title: {
rendered: "We are chopped down"
}
},
{
id: 535,
title: {
rendered: "Recover"
}
},
{
id: 528,
title: {
rendered: "Teacher said : Explain the law of gravitation."
}
},
{
id: 517,
title: {
rendered: "Person who ordered Swami to dress up and go to school __________?"
}
},
{
id: 514,
title: {
rendered: "Time when Swami complained of a headache _________?"
}
},
{
id: 512,
title: {
rendered: "When Swami ought to have been in the school prayer hall, he was lying on the?"
}
},
{
id: 510,
title: {
rendered: "Put out"
}
},
{
id: 505,
title: {
rendered: "Make out"
}
},
{
id: 502,
title: {
rendered: "Why did not Swami go to School?"
}
},
{
id: 484,
title: {
rendered: "With a shudder Swami realized that it was?"
}
}
]