我在Android上是全新的。我试着设置菜单按钮并遇到了这个问题。我在这个论坛上检查了这一点,发现它意味着没有定义的东西,但无法弄清楚我的代码中哪一个未定义。请帮忙!任何建议都将不胜感激。
顺便说一下,如果我单独运行它,Camera_SettingActivity.java就能正常工作。
public class VideoViewActivity extends Activity {
protected int my_num = 2280;
protected Intent intent_camera;
/** Called when the activity is first created. */
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.layout.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
intent_camera = new Intent();
switch (item.getItemId()) {
case R.id.camera:
intent_camera.setClass(VideoViewActivity.this, Camera_SettingActivity.class);
startActivityForResult(intent_camera, my_num);
break;
}
return true;
}
}
public class Camera_SettingActivity extends Activity {
protected int my_num = 1228;
private Bundle bundle;
public static String url = "rtsp://v3.cache8.c.youtube.com/CiILENy73wIaGQmXovF6e-Rf-BMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp";
private VideoView videoView1 = null;
private Context ctx = null;
private ProgressBar prog1 = null;
protected String str_IP;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_camera_layout);
bundle = this.getIntent().getExtras();
str_IP = bundle.getString("editIP");
Button test1 = (Button) findViewById(R.id.button_test1);
test1.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
prog1 = (ProgressBar)findViewById(R.id.progressBar1);
videoView1 = (VideoView) findViewById(R.id.videoView1);
Uri video = Uri.parse(url);
videoView1.setVideoURI(video);
videoView1.setOnErrorListener(new OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
Toast.makeText(ctx, "Error occured", 500).show();
return false;
}
});
videoView1.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer arg0) {
prog1.setVisibility(View.GONE);
videoView1.start();
}
});
}
});
}
@Override
protected void onDestroy() {
try{
videoView1.stopPlayback();
}catch(Exception e){
//
}
super.onDestroy();
}
}
答案 0 :(得分:1)
每个活动都应该有onCreate
()方法。你的代码遗漏了它。这可能会导致错误。在方法中添加onCreate()和setContentView()。