Java savedInstanceState捆绑包中的NullPointerException

当我的代码试图访问由Activity类的onSaveInstanceState方法创建的键/值对中的值时，我得到一个NullPointerException

我设置了断点，我知道事实上我的包不是空的，它包含对键/值的引用。我不明白为什么会出现这个运行时错误。这是我的onSaveInstanceState代码

@Override
protected void onSaveInstanceState(Bundle outState) {

    int mPoints = winCount;
    int hPoints = loseCount;
    String reTextView = resultsTextView.getText().toString();
    String pTextView = pointsTextView.getText().toString();
    String roTextView = rollTextView.getText().toString();

    outState.putInt("MY_POINTS", mPoints);
    outState.putInt("HOUSE_POINTS", hPoints);
    outState.putString("RESULTS", reTextView);
    outState.putString("POINTS", pTextView);
    outState.putString("ROLL", roTextView);

    super.onSaveInstanceState(outState);
}

这是我用来恢复onCreate方法状态的代码

// check if app just started or is being restored from memory
      if ( savedInstanceState == null ) // the app just started running
      {
         winCount = 0; 
         loseCount = 0; 
      } 
      else 
      {
         winCount = savedInstanceState.getInt("MY_POINTS");
         loseCount = savedInstanceState.getInt("HOUSE_POINTS");

         resultsTextView.setText(String.valueOf(savedInstanceState.getString("RESULTS")));
         pointsTextView.setText(String.valueOf(savedInstanceState.getString("POINTS")));
         rollTextView.setText(String.valueOf(savedInstanceState.getString("ROLL")));
      } 

我在以resultsTextView.setText开头的行上得到运行时错误。。。下面是在调试模式下从断点检索到的savedInstanceState包的内容

 Bundle[{RESULTS=Roll Again, MY_POINTS=2, POINTS=Your Point is 8,
 HOUSE_POINTS=2,
 android:viewHierarchyState=Bundle[{android:Panels=android.util.SparseArray@421c5560,
 android:views=android.util.SparseArray@421c5358,
 android:ActionBar=android.util.SparseArray@421c57f8}], ROLL=You Rolled
 Easy Four}]

正如您所看到的，我所有的字符串都有一个值，有趣的是，我没有得到int变量（winCount和loseCount）上的NullPointerException运行时错误，但我得到的是字符串值。谢谢你的帮助

更新：这是log cat的整个错误日志，我有resultsTextView.setText。。。在第68行（onCreat（）上的else块内）

这是我的整个onCreate方法，因为许多评论员要求查看整个方法。希望有帮助

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity);

          // check if app just started or is being restored from memory
          if ( savedInstanceState == null ) // the app just started running
          {
             winCount = 0; 
             loseCount = 0; 
          } 
          else 
          {
             winCount = savedInstanceState.getInt("MY_POINTS");
             loseCount = savedInstanceState.getInt("HOUSE_POINTS");

             resultsTextView.setText(savedInstanceState.getString("RESULTS"));
             pointsTextView.setText(savedInstanceState.getString("POINTS"));
             rollTextView.setText(savedInstanceState.getString("ROLL"));
          } 


        die1 = (ImageView) findViewById(R.id.imageView1);
        die2 = (ImageView) findViewById(R.id.imageView2);
        dealButton = (Button) findViewById(R.id.dealButton);
        resetButton = (Button) findViewById(R.id.resetButton);
        resultsTextView = (TextView) findViewById(R.id.resultsTextView);
        myPointsTextView = (TextView) findViewById(R.id.myPointstTextView);
        housePointsTextView = (TextView) findViewById(R.id.housePointsTextView);
        pointsTextView = (TextView) findViewById(R.id.pointsTextView1);
        rollTextView = (TextView) findViewById(R.id.rollTextView);

        dealButton.setOnClickListener(dealButtonListener);
        resetButton.setOnClickListener(resetButtonLinstener);

        //on shake event
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        mShakeDetector = new ShakeDetector(new OnShakeListener() {

            @Override
            public void onShake() {
               game(rollDice());
            }
        });


        resultsTextView.setTextColor(Color.BLACK);
        myPointsTextView.setText(String.format("%s", winCount));
        housePointsTextView.setText(String.format("%s", loseCount));

    }

---

在调用setText方法之前，应该初始化

TextView

s。所以onCreate应该是这样的：

        setContentView(R.layout.activity);

        die1 = (ImageView) findViewById(R.id.imageView1);
        die2 = (ImageView) findViewById(R.id.imageView2);
        dealButton = (Button) findViewById(R.id.dealButton);
        resetButton = (Button) findViewById(R.id.resetButton);
        resultsTextView = (TextView) findViewById(R.id.resultsTextView);
        myPointsTextView = (TextView) findViewById(R.id.myPointstTextView);
        housePointsTextView = (TextView) findViewById(R.id.housePointsTextView);
        pointsTextView = (TextView) findViewById(R.id.pointsTextView1);
        rollTextView = (TextView) findViewById(R.id.rollTextView);

          // check if app just started or is being restored from memory
          if ( savedInstanceState == null ) // the app just started running
          {
             winCount = 0; 
             loseCount = 0; 
          } 
          else 
          {
             winCount = savedInstanceState.getInt("MY_POINTS");
             loseCount = savedInstanceState.getInt("HOUSE_POINTS");

             resultsTextView.setText(savedInstanceState.getString("RESULTS"));
             pointsTextView.setText(savedInstanceState.getString("POINTS"));
             rollTextView.setText(savedInstanceState.getString("ROLL"));
          } 
...

---

你可以删除String.valueOf，因为savedInstanceState.getString已经返回String。你能将异常日志粘贴到这里吗？@Niko起初我没有String.valueOf，但我得到了相同的运行时错误，我认为这可能是由于一些奇怪的未匹配，我添加了这个错误。我两种方式都没有工作！resultsTextView您可以在哪里初始化它？您可以在创建后发布完成function@alkber我用整个错误日志更新了问题谢谢它起作用了，在你的评论之后，我真的这样做了，现在它起作用了。这和我在回答中提到的是一样的。干得好吗

        setContentView(R.layout.activity);

        die1 = (ImageView) findViewById(R.id.imageView1);
        die2 = (ImageView) findViewById(R.id.imageView2);
        dealButton = (Button) findViewById(R.id.dealButton);
        resetButton = (Button) findViewById(R.id.resetButton);
        resultsTextView = (TextView) findViewById(R.id.resultsTextView);
        myPointsTextView = (TextView) findViewById(R.id.myPointstTextView);
        housePointsTextView = (TextView) findViewById(R.id.housePointsTextView);
        pointsTextView = (TextView) findViewById(R.id.pointsTextView1);
        rollTextView = (TextView) findViewById(R.id.rollTextView);

          // check if app just started or is being restored from memory
          if ( savedInstanceState == null ) // the app just started running
          {
             winCount = 0; 
             loseCount = 0; 
          } 
          else 
          {
             winCount = savedInstanceState.getInt("MY_POINTS");
             loseCount = savedInstanceState.getInt("HOUSE_POINTS");

             resultsTextView.setText(savedInstanceState.getString("RESULTS"));
             pointsTextView.setText(savedInstanceState.getString("POINTS"));
             rollTextView.setText(savedInstanceState.getString("ROLL"));
          } 
...