Android App catch Exception

防止app在使用过程中弹出“非常抱歉，xxx已停止运行”，在应用中实现UncaughtExceptionHandler，并在应用Application onCreate时启动线程即可，具体代码如下：

 

1.实现UncaughtExceptionHandler，并将捕获的异常信息保存到指定的文件中，方便出错后分析问题。

import java.io.File;

import java.io.FileOutputStream;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.io.Writer;

import java.lang.Thread.UncaughtExceptionHandler;

import java.lang.reflect.Field;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import android.content.Context;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.os.Build;

import android.os.Looper;

import android.util.Log;

import android.widget.Toast;

/**

 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.

 * 

 * @author user

 * 

 */

public class CrashHandler implements UncaughtExceptionHandler {

public static final String TAG = "CrashHandler";

private Thread.UncaughtExceptionHandler mDefaultHandler;

private static CrashHandler INSTANCE = new CrashHandler();

private Context mContext;

private Map<String, String> infos = new HashMap<String, String>();

private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

private CrashHandler() {

}

public static CrashHandler getInstance() {

return INSTANCE;

}

/**

* 初始化

* 

* @param context

*/

public void init(Context context) {

mContext = context;

mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();

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) {

if(!handleException(ex) && mDefaultHandler != null) {

mDefaultHandler.uncaughtException(thread, ex);

} else {

try {

Thread.sleep(3000);

} catch (InterruptedException e) {

Log.e(TAG, "error : ", e);

}

android.os.Process.killProcess(android.os.Process.myPid());

System.exit(0);

}

}

/**

* 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();

collectDeviceInfo(mContext);

saveCrashInfo2File(ex);

return true;

}

/**

* 收集设备参数信息

* @param ctx

*/

public void collectDeviceInfo(Context ctx) {

try {

PackageManager pm = ctx.getPackageManager();

PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);

if(pi != null) {

String versionName = pi.versionName == null ? "null" : pi.versionName;

String versionCode = pi.versionCode + "";

infos.put("versionName", versionName);

infos.put("versionCode", versionCode);

}

} catch (NameNotFoundException e) {

Log.e(TAG, "an error occured when collect package info", e);

}

Field[] fields = Build.class.getDeclaredFields();

for(Field field : fields) {

try {

field.setAccessible(true);

infos.put(field.getName(), field.get(null).toString());

Log.d(TAG, field.getName() + " : " + field.get(null));

} catch (Exception e) {

Log.e(TAG, "an error occured when collect crash info", e);

}

}

}

/**

* 保存错误信息到文件中

* 

* @param ex

* @return

*/

private String saveCrashInfo2File(Throwable ex) {

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);

try {

long timestamp = System.currentTimeMillis();

String time = formatter.format(new Date());

String fileName = "crash-" + time + "-" + timestamp + ".txt";

String path = "/mnt/sdcard/musicCrash/";

File dir = new File(path);

if(!dir.exists()) {

dir.mkdirs();

}

if(dir.listFiles().length > 50) {

for(File file : dir.listFiles()) {

if(dir.listFiles().length > 50) {

file.delete();

}

}

}

FileOutputStream fos = new FileOutputStream(path + fileName);

Log.e(TAG, new String(sb));

fos.write(sb.toString().getBytes());

fos.close();

return fileName;

} catch (Exception e) {

Log.e(TAG, "an error occured while writing file...", e);

}

return null;

}

}

2.在应用的Application中启动UncaughtExceptionHandler来监听应用的异常。

public class MyApplication extends Application {

   

@Override

public void onCreate() {

super.onCreate();

Log.i(TAG, "application oncreate-----");

CrashHandler crashHandler = CrashHandler.getInstance();

crashHandler.init(getApplicationContext());

}

   

}