Question

我是开发android的新手。我在编写代码并运行调试器后得到了：＆＃34;不幸的是App停止了＃34;

我的main.java：

package com.stream.streamvideo;
import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class main extends Activity implements     SurfaceHolder.Callback,MediaPlayer.OnPreparedListener {
private MediaPlayer mediaPlayer;
private SurfaceHolder vidHolder;
private SurfaceView vidSurface;
String vidAddress = "https://archive.org/download/ksnn_compilation_master_the_internet/ksnn_compilation_master_the_internet_512kb.mp4";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    vidSurface = (SurfaceView) findViewById(R.id.surfView);
    vidHolder = vidSurface.getHolder();
    vidHolder.addCallback(this);
    setContentView(R.layout.activity_main);
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
    // TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
//setup
    try {
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setDisplay(vidHolder);
        mediaPlayer.setDataSource(vidAddress);
        mediaPlayer.prepare();
        mediaPlayer.setOnPreparedListener(this);
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    }
    catch(Exception e){
        e.printStackTrace();
    }
}

@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
    // TODO Auto-generated method stub
}

@Override
public void onPrepared(MediaPlayer mp) {
//start playback
    mediaPlayer.start();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

我的activity_main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <SurfaceView
         android:id="@+id/surfView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
</RelativeLayout>

我不知道问题出在哪里有谁知道我的问题在哪里？

Answer 1

尝试替换此代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    vidSurface = (SurfaceView) findViewById(R.id.surfView);
    vidHolder = vidSurface.getHolder();
    vidHolder.addCallback(this);
}

注意：在从xml找到任何视图之前，您必须调用setContentView（）。

不幸的是，“app”在Android Studio中停止了

1 个答案: