//全域性類
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.Environment;
import android.os.Looper;
import 
 
android.util.Log;
import android.widget.Toast;

/**
 * UncaughtException處理類,當程式發生Uncaught異常的時候,有該類來接管程式,並記錄傳送錯誤報告.
 *
 * @author user
 *
 */
public class CrashHandler implements UncaughtExceptionHandler {

    public static final String TAG = "CrashHandler";

    //系統預設的UncaughtException處理類
private UncaughtExceptionHandler mDefaultHandler
 
;
    //CrashHandler例項
private static CrashHandler INSTANCE = new CrashHandler();
    //程式的Context物件
private Context mContext;
    //用來儲存裝置資訊和異常資訊
private Map<String, String> infos = new HashMap<String, String>();

    //用於格式化日期,作為日誌檔名的一部分
private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /** 保證只有一個CrashHandler例項 */
private CrashHandler() {
    }

    /** 獲取CrashHandler例項 ,單例模式 */
public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
*/
public void init(Context context) {
        mContext = context;
        //獲取系統預設的UncaughtException處理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //設定該CrashHandler為程式的預設處理器
Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 當UncaughtException發生時會轉入該函式來處理
     */
@Override
public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            //如果使用者沒有處理則讓系統預設的異常處理器來處理
mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            //退出程式
android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定義錯誤處理,收集錯誤資訊 傳送錯誤報告等操作均在此完成.
     *
     * @param ex
* @return true:如果處理了該異常資訊;否則返回false.
     */
private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        //使用Toast來顯示異常資訊
new Thread() {
            @Override
public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉,程式出現異常,即將退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        //收集裝置引數資訊
collectDeviceInfo(mContext);
        //儲存日誌檔案
saveCrashInfo2File(ex);
        return true;
    }

    /**
     * 收集裝置引數資訊
     * @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);
            }
        }
    }

    /**
     * 儲存錯誤資訊到檔案中
     *
     * @param ex
* @return  返回檔名稱,便於將檔案傳送到伺服器
     */
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 + ".log";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                String path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/crash/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }
}

//========================

public class MyApp extends Application {
    @Override
public void onCreate() {
        super.onCreate();
        CrashHandler crashHandler = CrashHandler.getInstance();
        crashHandler.init(getApplicationContext());
    }
}

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