Question

我已经从我在课堂上编写的另一个应用程序进行了研究，该应用程序使用Intent更改为另一个类和布局，我认为代码与下面的代码类似。事实上，当我点击“新游戏”时，按钮它只是崩溃。我一直在评论.stop的{{1}}和.release函数，我确实注意到它会在尝试进入MediaPlayer之前杀死音乐（然后崩溃）。我感谢任何帮助，我花了几天时间试图挖掘论坛：）

MainActivity.java：

Intent

}

Game.java：

public class MainActivity extends Activity {

private MediaPlayer mpTheme;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mpTheme=MediaPlayer.create(MainActivity.this, R.raw.sttngtheme);
    mpTheme.start();
    Button newGameButton = (Button) findViewById(R.id.newGameButton);
    Button loadGameButton = (Button) findViewById(R.id.loadGameButton);
    Button instructionsButton = (Button) findViewById(R.id.instructionsButton);
    final MainActivity mainActivity = this;

    newGameButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            mpTheme.stop();
            mpTheme.release();
            //Toast.makeText(getBaseContext(), "You clicked New Game", Toast.LENGTH_LONG).show();
            Intent startGameIntent = new Intent(mainActivity, Game.class);
            startActivity(startGameIntent);

        }
    });

    loadGameButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            Toast.makeText(getBaseContext(), "Loading capability not yet coded.", Toast.LENGTH_LONG).show();

        }
    });


    instructionsButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Toast.makeText(getBaseContext(), "Instructions not yet coded.", Toast.LENGTH_LONG).show();

        }
    });


}//end onCreate

@Override
protected void onPause(){
    super.onPause();
    if(mpTheme.isPlaying()){
        mpTheme.pause();
    }
}

@Override
protected void onStop(){
    super.onStop();
    if(mpTheme.isPlaying()){
        mpTheme.stop();
        mpTheme.release();
    }
}

@Override
protected void onResume(){
    super.onResume();
    if(mpTheme.isPlaying()==false){
        mpTheme.start();
    }
}

}

logcat的：

public class Game extends Activity{

protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.quadrantspace);
}

Answer 1

在清单文件中添加目标活动。有关如何将Game.class添加到Manifest的更多信息，请查看official docs

此外，您无需单独声明mainActivity变量即可在newGameButton setOnClickListener方法中使用。你只需要创建一个这样的意图 -

Intent i = new Intent(MainActivity.this, Game.class);
startActivity(i);

意图打开下一个布局崩溃

1 个答案: