每个android应用都是由一个Application和多个activity或者server构成.应用启动时,会首先启动Application.在Application的onCreate方法中调用

Thread.setDefaultUncaughtExceptionHandler(handler);

就可以捕获导致应用崩溃的错误信息了.

首先应用要有读写sd卡权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

自定义一个Application,并在AndroidManifest.xml中使用这个Application

<applicationandroid:name=".MyApplication">...
</application>

public class MyApplication extends Application {private static final String LOG_DIR = Environment.getExternalStorageDirectory().getAbsolutePath() + "/oldfeel/log/";private static final String LOG_NAME = getCurrentDateString() + ".txt";private ArrayList<Activity> list = new ArrayList<Activity>();@Overridepublic void onCreate() {super.onCreate();Thread.setDefaultUncaughtExceptionHandler(handler);}UncaughtExceptionHandler handler = new UncaughtExceptionHandler() {@Overridepublic void uncaughtException(Thread thread, Throwable ex) {writeErrorLog(ex);Intent intent = new Intent(getApplicationContext(),CollapseActivity.class);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);exit();}};/*** 打印错误日志* * @param ex*/protected void writeErrorLog(Throwable ex) {String info = null;ByteArrayOutputStream baos = null;PrintStream printStream = null;try {baos = new ByteArrayOutputStream();printStream = new PrintStream(baos);ex.printStackTrace(printStream);byte[] data = baos.toByteArray();info = new String(data);data = null;} catch (Exception e) {e.printStackTrace();} finally {try {if (printStream != null) {printStream.close();}if (baos != null) {baos.close();}} catch (Exception e) {e.printStackTrace();}}Log.d("example", "崩溃信息\n" + info);File dir = new File(LOG_DIR);if (!dir.exists()) {dir.mkdirs();}File file = new File(dir, LOG_NAME);try {FileOutputStream fileOutputStream = new FileOutputStream(file, true);fileOutputStream.write(info.getBytes());fileOutputStream.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/*** 获取当前日期* * @return*/private static String getCurrentDateString() {String result = null;SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd",Locale.getDefault());Date nowDate = new Date();result = sdf.format(nowDate);return result;}/*** Activity关闭时，删除Activity列表中的Activity对象*/public void removeActivity(Activity a) {list.remove(a);}/*** 向Activity列表中添加Activity对象*/public void addActivity(Activity a) {list.add(a);}/*** 关闭Activity列表中的所有Activity*/public void exit() {for (Activity activity : list) {if (null != activity) {activity.finish();}}// 杀死该应用进程android.os.Process.killProcess(android.os.Process.myPid());}
}

系统错误后要还是要提示用户系统错误.这个是崩溃activity,

<activityandroid:name="com.example.test.CollapseActivity"android:theme="@android:style/Theme.Holo.Dialog.MinWidth" >
</activity>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"android:orientation="horizontal" ><Buttonandroid:id="@+id/collapse_restart"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_weight="1.0"android:text="重启应用" /><Buttonandroid:id="@+id/collapse_exit"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_weight="1.0"android:text="退出应用" /></LinearLayout>

public class CollapseActivity extends Activity {private Button btnRestart, btnExit;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.collapse_activity);setTitle("应用崩溃了");btnRestart = (Button) findViewById(R.id.collapse_restart);btnExit = (Button) findViewById(R.id.collapse_exit);btnRestart.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(getApplicationContext(),MainActivity.class);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);finish();}});btnExit.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {finish();}});}
}