在android中使用TextView的问题

Question

我的TextView出现问题。我有一个显示耗材信息的PlayScreenActivity。在屏幕的顶部。然后我去商店的屏幕买了补给品。当我回来时所有其他人改变但是1如果我转动手机和方向改变它将显示新值，这是我能看到所购买的附加物品的唯一方式。任何人都知道为什么会这样？

我将屏幕方向设置为纵向，以查看它是否能够正常工作，如果它无法切换但无法修复。

修改

以下是我的活动代码的副本：

public class PlayscreenActivity extends Activity {     数据数据_;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ((TextView)findViewById(R.id.lemonsLeftText)).setText(
            "Lemons: "  );
    ((TextView)findViewById(R.id.sugarLeftText)).setText(
            "Sugar: "  );
    ((TextView)findViewById(R.id.iceLeftText)).setText(
            "Ice: "  );        
    ((TextView)findViewById(R.id.cupsLeftText)).setText(
            "Cups: "  );
    ((Button)findViewById(R.id.btnshop)).setOnClickListener(
            new SupplyShopListener());
}
private class SupplyShopListener implements OnClickListener{
      public void onClick(View v){
          Intent i = new Intent(v.getContext(), SupplyShopActivity.class);
          startActivity(i);
          //refreshDisplay();
      }

}

@Override
public void onResume(){
    super.onResume();
    data_ = getData();
    refreshDisplay();
}

@Override
public void onPause(){
    super.onPause();
    saveData();
    refreshDisplay();
}

@Override
public void onConfigurationChanged(Configuration newConfig){
    super.onConfigurationChanged(newConfig);
    //refreshDisplay();
}

private Data getData() {
    GameData player_data = new GameData(this);
    player_data.open();
    Data game_state = new Data(player_data.getGameString());
    player_data.close();
    return game_state;
  }

private void saveData() {
    GameData player_data = new GameData(this);
    player_data.open();
    player_data.setGameString(data_.SerializeGame());
    player_data.close();

}
private void refreshDisplay() {

    NumberFormat nf = NumberFormat.getInstance();
    nf.setMinimumFractionDigits(2);
    nf.setMaximumFractionDigits(2);
    String totalCash = nf.format(data_.cash_);

    ((TextView)findViewById(R.id.lemonsLeftText)).setText(
            "Lemons: "  + Integer.toString(data_.lemons_) );        
    ((TextView)findViewById(R.id.sugarLeftText)).setText(
            "Sugar: "  + Integer.toString(data_.sugar_) );
    ((TextView)findViewById(R.id.iceLeftText)).setText(
            "Ice: "  + Integer.toString(data_.ice_) );
    ((TextView)findViewById(R.id.cupsLeftText)).setText(
            "Cups: "  + Integer.toString(data_.cups_) );
    ((TextView)findViewById(R.id.totalCashText)).setText(
            "Cash : "  + (totalCash) );

}

}

Answer 1

您可能会在错误的位置更新textviews。 或者在更改后调用textview.invalidate() - 这通常不是必需的，但可能是在他们更改时没有用户互动。

Answer 2

  

...如果我转动手机并改变方向，它会显示新值

Android会在发生运行时配置更改时销毁并重新创建活动。在屏幕旋转中绘制新变量是有道理的，因为重新创建了整个活动：

http://developer.android.com/guide/topics/resources/runtime-changes.html

如果您的PlayScreenActivity恢复时大多数TextView小部件都在更新，那么您的refreshDisplay（）调用正在工作（在某种程度上）。哪个小部件不重绘？我也会抛出一些日志记录并像zapl建议的那样观看LogCat。

修改

带有一些日志记录的示例代码（我将小部件移动到字段中......）

public class PlayscreenActivity extends Activity
{
    Data data_;

    String TAG = "PlayScreenActivity";

    TextView lemonsLeftTextLabel;
    TextView sugarLeftTextLabel;
    TextView iceLeftLabel;
    TextView cupsLeftTextLabel;
    TextView totalCashTextLabel;
    Button shopButton;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "Creating PlayScreen activity...");
        setContentView(R.layout.main);

        Log.d(TAG, "Assigning buttons...");
        lemonsLeftTextLabel = (TextView) findViewById(R.id.lemonsLeftText);
        sugarLeftTextLabel = (TextView) findViewById(R.id.sugarLeftText);
        iceLeftLabel = (TextView) findViewById(R.id.iceLeftText);
        cupsLeftTextLabel = (TextView) findViewById(R.id.cupsLeftText);
        totalCashTextLabel = (TextView) findViewById(R.id.totalCashText);

        shopButton = (Button) findViewById(R.id.btnshop);

        lemonsLeftTextLabel.setText("Lemons: ");
        sugarLeftTextLabel.setText("Sugar: ");
        iceLeftLabel.setText("Ice: ");
        cupsLeftTextLabel.setText("Cups: ");

        shopButton.setOnClickListener(new SupplyShopListener());
        Log.d(TAG, "onCreate() complete");
    }
    private class SupplyShopListener implements View.OnClickListener {
        public void onClick(View v){
            //Intent i = new Intent(v.getContext(), SupplyShopActivity.class);
            //startActivity(i);
            refreshDisplay();
        }
    }

    @Override
    public void onResume(){
        Log.d(TAG, "onResume() called");
        super.onResume();
        data_ = getData();
        Log.d(TAG, "Data fetched");
        Log.d(TAG, "Contents of data = " +
                "Lemons: " + Integer.toString(data_.lemons_) + " | " +
                "Sugar: " + Integer.toString(data_.sugar_) + " | " +
                "Ice: " + Integer.toString(data_.ice_) + " | " +
                "Cups: " + Integer.toString(data_.cups_) + " | " +
                "Cash: " + data_.cash_ + " | ");

        refreshDisplay();
    }

    @Override
    public void onPause(){
        Log.d(TAG, "onPause() called");
        super.onPause();
        saveData();
        refreshDisplay();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig){
        Log.d(TAG, "onConfigurationChanged() called");
        super.onConfigurationChanged(newConfig);
    }

    private Data getData() {
        Log.d(TAG, "getData() called - restoring");
        GameData player_data = new GameData(this);
        player_data.open();
        Log.d(TAG, "Pulling data from game string...");
        Data game_state = new Data(player_data.getGameString());
        player_data.close();
        Log.d(TAG, "Contents of data = " +
                "Lemons: " + Integer.toString(game_state.lemons_) + " | " +
                "Sugar: " + Integer.toString(game_state.sugar_) + " | " +
                "Ice: " + Integer.toString(game_state.ice_) + " | " +
                "Cups: " + Integer.toString(game_state.cups_) + " | " +
                "Cash: " + game_state.cash_ + " | ");
        return game_state;
    }

    private void saveData() {
        Log.d(TAG, "saveData() called - saving");
        GameData player_data = new GameData(this);
        player_data.open();
        Log.d(TAG, "Serializing data into GameData object");
        Log.d(TAG, "Contents of data = " +
                "Lemons: " + Integer.toString(data_.lemons_) + " | " +
                "Sugar: " + Integer.toString(data_.sugar_) + " | " +
                "Ice: " + Integer.toString(data_.ice_) + " | " +
                "Cups: " + Integer.toString(data_.cups_) + " | " +
                "Cash: " + data_.cash_ + " | ");
        player_data.setGameString(data_.SerializeGame());
        player_data.close();

    }
    private void refreshDisplay() {
        Log.d(TAG, "refreshDisplay() called - redrawing UI");

        NumberFormat nf = NumberFormat.getInstance();
        nf.setMinimumFractionDigits(2);
        nf.setMaximumFractionDigits(2);
        String totalCash = nf.format(data_.cash_);

        lemonsLeftTextLabel.setText("Lemons: " + Integer.toString(data_.lemons_));
        sugarLeftTextLabel.setText("Sugar: " + Integer.toString(data_.sugar_));
        iceLeftLabel.setText("Ice: " + Integer.toString(data_.ice_));
        cupsLeftTextLabel.setText("Cups: " + Integer.toString(data_.cups_));
        totalCashTextLabel.setText("Cups: " + totalCash);

    }
}