我的應用程序總是崩潰，但我不知道爲什麼

Question

這是崩潰，當我點擊開始，但我不知道爲什麼

我認爲這是與在bruteForce功能threding認爲

package com.my.app; 
import android.app.*; 
import android.os.*; 
import android.view.*; 
import android.view.View.*; 
import android.widget.*; 
import android.content.*; 
import android.graphics.*; 
import android.media.*; 
import android.net.*; 
import android.text.*; 
import android.util.*; 
import java.util.*; 
import java.text.*; 
import android.test.*; 
import android.view.animation.*; 
import android.widget.Button; 


public class TestActivity extends Activity { 

private LinearLayout linear1; 
private TextView original; 
private TextView match; 
private TextView text; 
private Button bstart; 
String attempt = new String(); 

boolean running; 
int counter; 

private String hash = ""; 
public String username = new String(); 
public static String password = "ZZZZZ"; 
public static char[] charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray(); 
private static char[] currentGuess = new char[1]; 




@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.test); 
    initialize(); 
    initializeLogic(); 
} 

private void initialize() { 
    linear1 = (LinearLayout) findViewById(R.id.linear1); 
    original = (TextView) findViewById(R.id.original); 
    match = (TextView) findViewById(R.id.match); 
    text = (TextView) findViewById(R.id.text); 
    bstart = (Button) findViewById(R.id.bstart); 

    bstart.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View _v) { 
       bruteForce(); 
      } 
     }); 
} 


private void initializeLogic() { 
    Intent test = getIntent(); 
    hash = test.getStringExtra("hash"); 
    original.setText(password); 
} 

public void increment() 
{ 
    int index = currentGuess.length - 1; 
    while (index >= 0) 
    { 
     if (currentGuess[index] == charset[charset.length - 1]) 
     { 
      if (index == 0) 
      { 
       currentGuess = new char[currentGuess.length + 1]; 
       Arrays.fill(currentGuess, charset[0]); 
       break; 
      } 
      else 
      { 
       currentGuess[index] = charset[0]; 
       index--; 
      } 
     } 
     else 
     { 
      currentGuess[index] = charset[Arrays.binarySearch(charset, currentGuess[index]) + 1]; 
      break; 
     } 
    } 
} 

public String toString() 
{ 
    return String.valueOf(currentGuess); 
} 

public void bruteForce() 
{ 

    Animation animation = new Animation(){ 
     @Override 
     protected void applyTransformation(float interpolatedTime, Transformation t) { 
      text.setText(attempt); 
     } 
    }; 
    animation.setRepeatCount(Animation.INFINITE); 
    text.startAnimation(animation);   
    new Thread(){ 
     @Override 
     public void run() { 
      running = true; 
      while(running) 
       if (attempt.equals(password)) 
       { 
        text.setText(attempt); 
        this.stop(); 
       } 
      attempt = toString(); 
      text.setText(attempt); 
      increment(); 
     } 
    }.start(); 
} 

@Override 
protected void onStop() { 
    super.onStop(); 
    running = false; 
} 


public void BruteForceTest() 
{ 
    Arrays.fill(currentGuess, charset[0]); 
} 


// created automatically 
private void ShowMessage(String _s) { 
    Toast.makeText(getApplicationContext(), _s, Toast.LENGTH_SHORT).show(); 
} 

private int GetRandom(int _minValue ,int _maxValue){ 
    Random random = new Random(); 
    return random.nextInt(_maxValue - _minValue + 1) + _minValue; 
} 

public ArrayList<Integer> getCheckedItemPositionsToArray(ListView _list) { 
    ArrayList<Integer> _result = new ArrayList<Integer>(); 
    SparseBooleanArray _arr = _list.getCheckedItemPositions(); 
    for (int _iIdx = 0; _iIdx < _arr.size(); _iIdx++) { 
     if (_arr.valueAt(_iIdx)) 
      _result.add(_arr.keyAt(_iIdx)); 
    } 
    return _result; 
} 

} 

Answer 1

你的問題就出在這裏

new Thread(){ 
    @Override 
    public void run() { 
     running = true; 
     while(running) 
      if (attempt.equals(password)) 
      { 
       text.setText(attempt); 
       this.stop(); 
      } 
     attempt = toString(); 
     text.setText(attempt); 
     increment(); 
    } 
}.start(); 

您只能更新在主線程的UI元素。如果你想這樣做，你需要用text.setText(attempt)來包裝一個處理器，它將它發佈到主線程。例如

new Handler(Looper.getMainLooper()).post(new Runnable(){ 
    void run() { 
     text.setText(attempt); 
    } 
}); 

Looper.getMainLooper()（docs）將獲得主應用程序線程該處理器然後投遞的Runnable來。

Answer 2

if (attempt.equals(password)) 
{ 
getActivity().runOnUiThread(new Runnable() 
     { 
      @Override 
      public void run() 
      { 

       text.setText(attempt); 
      } 
     }); 

this.stop(); 
} 

同樣，無論你正在改變UI元素，如設置文本或顏色了變化做它在runOnUithread正如我上面一樣。