我知道有很多关于这个问题的问题,但没有一个对我有帮助.我尝试了所有但没有,仍然在我的logcat和应用程序崩溃中得到IllegalStateException.
这是我的MainActivity.java：
package com.orar.cngcnasaud;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private ListView mDrawerList;
private DrawerLayout mDrawer;
private CustomActionBarDrawerToggle mDrawerToggle;
private String[] menuItems;
private static final String TAG = "AudioDemo";
private static final String isPlaying = "Media is Playing";
private static final String notPlaying = "Media has stopped Playing";
MediaPlayer player;
Button playerButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_drawer);
player = MediaPlayer.create(this,R.raw.gc);
player.setLooping(false); // Set looping
// Get the button from the view
playerButton = (Button) this.findViewById(R.id.buttonmp);
playerButton.setText(R.string.stop_label);
playerButton.setOnClickListener((OnClickListener) this);
// Begin playing selected media
demoPlay();
// Release media instance to system
player.release();
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
// set a custom shadow that overlays the main content when the drawer
// opens
mDrawer.setDrawerShadow(R.drawable.drawer_shadow,GravityCompat.START);
_initMenu();
mDrawerToggle = new CustomActionBarDrawerToggle(this,mDrawer);
mDrawer.setDrawerListener(mDrawerToggle);
}
public void onClick(View v) {
Log.d(TAG,"onClick: " + v);
if (v.getId() == R.id.buttonmp) {
playPause();
}
}
private void demoPause() {
// TODO Auto-generated method stub
player.pause();
playerButton.setText(R.string.play_label);
Toast.makeText(this,notPlaying,Toast.LENGTH_LONG).show();
Log.d(TAG,notPlaying);
}
private void playPause() {
// TODO Auto-generated method stub
if(player.isPlaying()) {
demoPause();
} else {
demoPlay();
}
}
private void demoPlay() {
// TODO Auto-generated method stub
player.start();
playerButton.setText(R.string.stop_label);
Toast.makeText(this,isPlaying,isPlaying);
}
这不是整个活动,我的活动也有滑动菜单,但这是我的MediaPlayer的代码..非常感谢！
L.E：
logcat的：
02-24 19:09:24.011: E/AndroidRuntime(1323): FATAL EXCEPTION: main 02-24 19:09:24.011: E/AndroidRuntime(1323): java.lang.IllegalStateException 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.media.MediaPlayer.isPlaying(Native Method) 02-24 19:09:24.011: E/AndroidRuntime(1323): at com.orar.cngcnasaud.MainActivity.playPause(MainActivity.java:90) 02-24 19:09:24.011: E/AndroidRuntime(1323): at com.orar.cngcnasaud.MainActivity.onClick(MainActivity.java:72) 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.view.View.performClick(View.java:4204) 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.view.View$PerformClick.run(View.java:17355) 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.os.Handler.handleCallback(Handler.java:725) 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.os.Handler.dispatchMessage(Handler.java:92) 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.os.Looper.loop(Looper.java:137) 02-24 19:09:24.011: E/AndroidRuntime(1323): at android.app.ActivityThread.main(ActivityThread.java:5041) 02-24 19:09:24.011: E/AndroidRuntime(1323): at java.lang.reflect.Method.invokeNative(Native Method) 02-24 19:09:24.011: E/AndroidRuntime(1323): at java.lang.reflect.Method.invoke(Method.java:511) 02-24 19:09:24.011: E/AndroidRuntime(1323): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 02-24 19:09:24.011: E/AndroidRuntime(1323): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 02-24 19:09:24.011: E/AndroidRuntime(1323): at dalvik.system.NativeStart.main(Native Method)
解决方法
这里：
if(player.isPlaying()) {
在播放器尚未初始化时,您似乎正在调用“播放()方法”.在这种情况下,此方法抛出此IllegalStateException.
我认为理由是你在onCreate中实际发布了(！)MediaPlayer,请参阅：
// Release media instance to system
player.release();
您应该更好地使用Activity生命周期方法来管理释放MediaPlayer：
@Override
public void onPause() {
player.stop();
player.release();
super.onPause();
}
@Override
public void onResume() {
player = MediaPlayer.create(this,R.raw.gc);
player.setLooping(false);
player.start();
super.onResume();
}
