我从在手机上运行我的应用程序切换到nexus 10平板电脑，现在它说“不幸的是应用程序已停止。”
平板电脑正在运行4.4.2，我的目标api在清单中设置为19。
当我在调试模式下运行时，我得到Source Not Found。我尝试点击编辑源查找路径并添加我的项目，但没有运气。
我看了整个互联网，并没有任何运气解决这个问题。任何建议都会有很大帮助。
“java.lang.RuntimeException：无法启动活动ComponentInfo {com.looper.video/com.looper.video.MainActivity}：java.lang.NullPointerException”
修改
MainActivity：
package com.looper.video;
public class MainActivity extends Activity {
private VideoView video;
private MediaController ctlr;
final Uri firstVideoPath = Uri.parse("android.resource://com.looper.video/" + R.raw.wildlife);
final Uri secondVideoPath = Uri.parse("android.resource://com.looper.video/" + R.raw.wildlife1);
private String videosPath = Environment.getExternalStorageDirectory() + "/videos/";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
File folder = new File(videosPath);
File[] customFiles = folder.listFiles();
List<String> customFileNames = new ArrayList<String>();
for(File file : customFiles) {
customFileNames.add(file.getName());
}
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, customFileNames);
spinnerArrayAdapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );
Spinner spinner = (Spinner)findViewById(R.id.spinnerCustomFiles);
spinner.setAdapter(spinnerArrayAdapter);
video = (VideoView)findViewById(R.id.videoView1);
ctlr = new MediaController(this);
final Button firstVideoBtn = (Button) findViewById(R.id.firstVideoBtn);
firstVideoBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
playFirstVideo();
}
});
final Button secondVideoBtn = (Button) findViewById(R.id.secondVideoBtn);
secondVideoBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
playSecondVideo();
}
});
}
public void playFeatured(View v) {
try {
Spinner spinner = (Spinner)findViewById(R.id.spinnerCustomFiles);
String strPath = videosPath + spinner.getSelectedItem().toString();
Toast.makeText(this, strPath, Toast.LENGTH_LONG).show();
//Uri path = Uri.parse(videosPath + spinner.getSelectedItem().toString());
video.setVideoPath(strPath);
ctlr.setMediaPlayer(video);
video.setMediaController(ctlr);
video.requestFocus();
video.start();
video.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer vmp) {
playSecondVideo();
}
});
} catch(Exception e) {
System.out.println(e.getMessage());
}
}
public void playFirstVideo() {
video.setVideoURI(firstVideoPath);
ctlr.setMediaPlayer(video);
video.setMediaController(ctlr);
video.requestFocus();
video.start();
video.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer vmp) {
playSecondVideo();
}
});
}
public void playSecondVideo() {
SharedPreferences sp = getSharedPreferences("schedule", Context.MODE_PRIVATE);
//SimpleDateFormat sdf = new SimpleDateFormat("hh:mm");
String startTime = sp.getString("startTime", "");
String endTime = sp.getString("endTime", "");
/*
//SimpleDateFormat parser = new SimpleDateFormat("HH:mm");
//Date dateStartTime = parser.parse(startTime);
//Date dateEndTime = parser.parse(endTime);
Date now = new Date();
try {
if (userDate.after(ten) && userDate.before(eighteen)) {
}
} catch (ParseException e) {
// Invalid date was entered
}
System.out.println("Now:"+now);
System.out.println("Start"+startTime);
System.out.println("End:"+endTime);
//if(now.before(dateEndTime) && now.after(dateStartTime)){
//disableAll();
//} else {
*
*/
video.setVideoURI(secondVideoPath);
ctlr.setMediaPlayer(video);
video.setMediaController(ctlr);
video.requestFocus();
video.start();
video.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer vmp) {
playSecondVideo();
}
});
//}
}
public void admin(View view)
{
//MySQLiteHelper db = new MySQLiteHelper(this);
//final String password = db.getUser(7).getPassword();
//db.close();
final AlertDialog.Builder alert = new AlertDialog.Builder(this);
final EditText pass = new EditText(this);
alert.setView(pass);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String value = pass.getText().toString().trim();
SharedPreferences sp1 = getSharedPreferences("Login", 0);
//String username = sp1.getString("UserName", "");
String password = sp1.getString("Password", "");
if(value.equals(password)) {
Intent intent = new Intent(getBaseContext(),Admin.class);
startActivity(intent);
}
//Toast.makeText(getApplicationContext(), password + " " + value, Toast.LENGTH_SHORT).show();
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.cancel();
}
});
alert.show();
}
@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);
}
public void disableAll(){
Button firstVideoBtn = (Button)findViewById(R.id.firstVideoBtn);
firstVideoBtn.setEnabled(false);
Button secondVideoBtn = (Button)findViewById(R.id.secondVideoBtn);
secondVideoBtn.setEnabled(false);
Spinner spinner = (Spinner)findViewById(R.id.spinnerCustomFiles);
spinner.setEnabled(false);
Button btnPlay = (Button)findViewById(R.id.btnPlayFeatured);
btnPlay.setEnabled(false);
VideoView videoView = (VideoView)findViewById(R.id.videoView1);
videoView.setEnabled(false);
}
}
完整logcat：
D/dalvikvm(2817): GC_FOR_ALLOC freed 58K, 4% free 3441K/3568K, paused 20ms, total 20ms
10-08 15:23:17.965: D/dalvikvm(2817): GC_FOR_ALLOC freed 2K, 4% free 3505K/3632K, paused 7ms, total 7ms
10-08 15:23:17.975: I/dalvikvm-heap(2817): Grow heap (frag case) to 8.739MB for 5515216-byte allocation
10-08 15:23:17.985: D/dalvikvm(2817): GC_FOR_ALLOC freed <1K, 2% free 8891K/9020K, paused 7ms, total 7ms
10-08 15:23:18.055: D/AndroidRuntime(2817): Shutting down VM
10-08 15:23:18.055: W/dalvikvm(2817): threadid=1: thread exiting with uncaught exception (group=0x4155eba8)
10-08 15:23:18.055: E/AndroidRuntime(2817): FATAL EXCEPTION: main
10-08 15:23:18.055: E/AndroidRuntime(2817): Process: com.looper.video, PID: 2817
10-08 15:23:18.055: E/AndroidRuntime(2817): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.looper.video/com.looper.video.MainActivity}: java.lang.NullPointerException
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.os.Handler.dispatchMessage(Handler.java:102)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.os.Looper.loop(Looper.java:136)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.ActivityThread.main(ActivityThread.java:5017)
10-08 15:23:18.055: E/AndroidRuntime(2817): at java.lang.reflect.Method.invokeNative(Native Method)
10-08 15:23:18.055: E/AndroidRuntime(2817): at java.lang.reflect.Method.invoke(Method.java:515)
10-08 15:23:18.055: E/AndroidRuntime(2817): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
10-08 15:23:18.055: E/AndroidRuntime(2817): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
10-08 15:23:18.055: E/AndroidRuntime(2817): at dalvik.system.NativeStart.main(Native Method)
10-08 15:23:18.055: E/AndroidRuntime(2817): Caused by: java.lang.NullPointerException
10-08 15:23:18.055: E/AndroidRuntime(2817): at com.looper.video.MainActivity.onCreate(MainActivity.java:52)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.Activity.performCreate(Activity.java:5231)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-08 15:23:18.055: E/AndroidRuntime(2817): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
10-08 15:23:18.055: E/AndroidRuntime(2817): ... 11 more