APP全局异常捕获，并保存本地文件

 public class CrashHandler implements Thread.UncaughtExceptionHandler {

public static final String TAG = "CrashHandler";

// 系统默认的UncaughtException处理类
private Thread.UncaughtExceptionHandler mDefaultHandler;
// CrashHandler实例
private static CrashHandler INSTANCE = new CrashHandler();
// 程序的Context对象
private Context mContext;

//用来存储设备信息和异常信息
private Map<String, String> infos = new HashMap<String, String>();

//用于格式化日期,作为日志文件名的一部分
private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

/**
* 保证只有一个CrashHandler实例
*/
private CrashHandler() {
}

/**
* 获取CrashHandler实例 ,单例模式
*/
public static CrashHandler getInstance() {
return INSTANCE;
}

/**
* 初始化
* @param context
*/
public void init(Context context) {
mContext = context;
// 获取系统默认的UncaughtException处理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
// 设置该CrashHandler为程序的默认处理器
Thread.setDefaultUncaughtExceptionHandler(this);
}

/**
* 当UncaughtException发生时会转入该函数来处理
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
// ToastUtil.show(mContext, ex.getMessage());
if (!handleException(ex) && mDefaultHandler != null) {
// 如果用户没有处理则让系统默认的异常处理器来处理
mDefaultHandler.uncaughtException(thread, ex);
} else {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
Log.e(TAG, "error : ", e);
}
// 退出程序
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
//            KJActivityStack.create().AppExit(mContext);// 结束整个应用程序
}
}

/**
* 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
* @param ex
* @return true:如果处理了该异常信息;否则返回false.
*/
private boolean handleException(Throwable ex) {
if (ex == null) {
return false;
}
// 使用Toast来显示异常信息
new Thread() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();
Looper.loop();
}
}.start();
//保存日志文件
String path = saveCrashInfo2File(ex);
return true;
}

/**
* 保存错误信息到文件中
* @param ex
* @return 返回文件名称, 便于将文件传送到服务器
*/
private String saveCrashInfo2File(Throwable ex) {
infos = PhoneUtils.collectDeviceInfo(mContext);
StringBuffer sb = new StringBuffer();
for (Map.Entry<String, String> entry : infos.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append(key + "=" + value + "\n");
}
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
ex.printStackTrace(printWriter);
Throwable cause = ex.getCause();
while (cause != null) {
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();
String result = writer.toString();
sb.append(result);
FileOutputStream fos = null;
try {
long timestamp = System.currentTimeMillis();
String time = formatter.format(new Date());
String fileName = "crash-" + time + "-" + timestamp + ".log";
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String path = "/sdcard/aaaaaaaaaaaaaaaaaaaaacrash/";
//                String path = mContext.getCacheDir() + "/crash/";
File dir = new File(path);
if (!dir.exists()) {
dir.mkdirs();
}
fos = new FileOutputStream(path + fileName);
fos.write(sb.toString().getBytes());
}
return fileName;
} catch (Exception e) {
Log.e(TAG, "an error occured while writing file...", e);
} finally {
try {
if (fos != null)
fos.close();
} catch (IOException e) {
Log.e(TAG, "an error occured while fos.close...", e);
}
}
return null;
}