android 监听应用程序异常，输出异常日志log

1--在manifest添加：
<application android:icon="@drawable/icon" android:label="@string/login_title"  android:theme="@style/skin"  android:name="com.XXX.application.LauncherApplication"  android:process="@string/process" >
 
public class LauncherApplication extends Application {private Context context;@Overridepublic void onCreate () {super.onCreate();AppExcepiton appException = AppExcepiton.getInstance();         appException.init(getApplicationContext()); }
2—
public class AppExcepiton implements UncaughtExceptionHandler {// 获取application 对象；private Context mContext;private Thread.UncaughtExceptionHandler defaultExceptionHandler;// 单例声明CustomException;private static AppExcepiton appException;private AppExcepiton() {}public static AppExcepiton getInstance() {if (appException == null) {appException = new AppExcepiton();}return appException;}@Overridepublic void uncaughtException(Thread thread, Throwable exception) {// TODO Auto-generated method stubString path = null;if (defaultExceptionHandler != null) {String state = Environment.getExternalStorageState();// 判断SdCard是否存在并且是可用的if (Environment.MEDIA_MOUNTED.equals(state)) {path = Environment.getExternalStorageDirectory().getPath();}// 创建一个logcat目录path = path + "/eIVS/log";File file = new File(path);if (!file.exists()) {file.mkdir();}String time = getCurrentTime();String fileName = time.substring(0, 9);File myFile = new File(path+"/"+fileName+".log");String str = "\n"+time+"-->"+"["+exception.getLocalizedMessage()+"]";try {FileWriter fw = new FileWriter(myFile, true);fw.write(str);fw.flush();fw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}Log.e("tag", "exception >>>>>>>" + exception.getLocalizedMessage());// 将异常抛出，则应用会弹出异常对话框.这里先注释掉// defaultExceptionHandler.uncaughtException(thread, exception);}}/** * 获得当前时间 * @return */public String getCurrentTime(){Time t = new Time();t.setToNow();int year = t.year;int month = t.month+1;int day =  t.monthDay;int hour = t.hour;int minute = t.minute;int second =  t.second;String time = year+"-"+month+"-"+day+" "+hour+":"+minute+":"+second;return time;}public void init(Context context) {mContext = context;defaultExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();Thread.setDefaultUncaughtExceptionHandler(this);}

3--在一个activity中模拟异常：

public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.login);  // 初始化资源信息  throw new RuntimeException("--------");//  init();  }

/**  * 删除超过一年的日志  * @param path  */ public void deleteOldFile(final String path){  File file = new File(path);  file.list(new FilenameFilter() {      @Override   public boolean accept(File dir, String filename) {    // TODO Auto-generated method stub    File file = new File(path+"/"+filename);    Long ago = file.lastModified();    Long now = System.currentTimeMillis();    //如果最后一次修改时间超过一年：3153600秒    if((now-ago) > 31536000){     file.delete();    }    return false;   }  });   }

//打印 有用信息 能够指出 错误代码的行数

@Overridepublic void uncaughtException(Thread thread, Throwable exception) {// TODO Auto-generated method stubStackTraceElement[] stack = exception.getCause().getStackTrace();  String path = null;if (defaultExceptionHandler != null) {String state = Environment.getExternalStorageState();// 判断SdCard是否存在并且是可用的if (Environment.MEDIA_MOUNTED.equals(state)) {path = Environment.getExternalStorageDirectory().getPath();}// 创建一个logcat目录path = path + "/eIVS/log";File file = new File(path);if (!file.exists()) {file.mkdir();}//删除过期文件deleteOldFile(path);String time = getCurrentTime();String fileName = time.substring(0, 9);File myFile = new File(path+"/"+fileName+".log"); try {   String str = "\n"+time+"-->"; FileOutputStream fos = new FileOutputStream(myFile,true); fos.write(str.getBytes());                 for (int i = 0; i < stack.length; i++) {                       fos.write(stack[i].toString().getBytes());                   }                    fos.flush();                   fos.close();                    } catch (Exception e) {                }  ｝