程式異常捕獲一個不留

不管你多麼仔細，程式總是會出錯，下面方法是個全域的異常捕獲方法！希望對大家有協助！

1.用的時候，需要在applicaion裡面調用，代碼如下：

CrashHandler crashHandler = CrashHandler.getInstance();         
crashHandler.init(this);

2. 下面是主要的功能類：

package com.google.utils; 

  
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
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.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,由該類來接管程式,並記錄發送錯誤報表.
 */ 
public class CrashHandler implements UncaughtExceptionHandler { 
    private static final String TAG = "CrashHandler"; 
    private Thread.UncaughtExceptionHandler mDefaultHandler;// 系統預設的UncaughtException處理類  
    private static CrashHandler INSTANCE = new CrashHandler();// CrashHandler執行個體  
    private Context mContext;// 程式的Context對象  
    private Map<String, String> info = new HashMap<String, String>();// 用來存放裝置資訊和異常資訊  
    private SimpleDateFormat format = new SimpleDateFormat(  "yyyy-MM-dd-HH-mm-ss");// 用于格式化日期,作為記錄檔名的一部分  
  
    /** 保證只有一個CrashHandler執行個體 */ 
    private CrashHandler() {} 
  
    /** 擷取CrashHandler執行個體 ,單例模式 */ 
    public static CrashHandler getInstance() { 
        return INSTANCE; 
    } 
   
    //初始化
    public void init(Context context) { 
        mContext = context; 
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();// 擷取系統預設的UncaughtException處理器  
        Thread.setDefaultUncaughtExceptionHandler(this);// 設定該CrashHandler為程式的預設處理器  
    } 
   
    /**
     * 當UncaughtException發生時會轉入該重寫的方法來處理
     */ 
    public void uncaughtException(Thread thread, Throwable ex) { 
        if (!handleException(ex) && mDefaultHandler != null) { 
            // 如果自訂的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);// 如果處理了，讓程式繼續運行3秒再退出，保證檔案儲存並上傳到伺服器  
            } catch (InterruptedException e) { 
                e.printStackTrace(); 
            } 
            // 退出程式  
            android.os.Process.killProcess(android.os.Process.myPid()); 
            System.exit(1); 
        } 
    } 
  
    /**
     * 自訂錯誤處理,收集錯誤資訊 發送錯誤報表等操作均在此完成.
     * @param ex  異常資訊
     × @ true 如果處理了該異常資訊;否則返回false.
     */ 
    public boolean handleException(Throwable ex) {
    Log.e("lixp", "ex ===========" + ex);
        if (ex == null) 
            return false; 
        new Thread() { 
            public void run() { 
                Looper.prepare(); 
                Toast.makeText(mContext, "異常退出。。。", 0).show(); 
                Looper.loop(); 
            } 
        }.start(); 
        // 收集裝置參數資訊  
        collectDeviceInfo(mContext); 
        // 儲存記錄檔  
        saveCrashInfo2File(ex); 
        return true; 
    } 
  
    /**
     * 收集裝置參數資訊
     * @param context
     */ 
    public void collectDeviceInfo(Context context) { 
        try { 
            PackageManager pm = context.getPackageManager();// 獲得包管理器  
            PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 
                    PackageManager.GET_ACTIVITIES);// 得到該應用的資訊，即主Activity  
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" 
                        : pi.versionName; 
                String versionCode = pi.versionCode + ""; 
                info.put("versionName", versionName); 
                info.put("versionCode", versionCode); 
            } 
        } catch (NameNotFoundException e) { 
            e.printStackTrace(); 
        } 
        // 反射機制
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) { 
            try { 
                field.setAccessible(true); 
                info.put(field.getName(), field.get("").toString()); 
                Log.d(TAG, field.getName() + ":" + field.get("")); 
            } catch (IllegalArgumentException e) { 
                e.printStackTrace(); 
            } catch (IllegalAccessException e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
    //用檔案儲存異常資訊
    private String saveCrashInfo2File(Throwable ex) { 
        StringBuffer sb = new StringBuffer(); 
        for (Map.Entry<String, String> entry : info.entrySet()) { 
            String key = entry.getKey(); 
            String value = entry.getValue(); 
            sb.append(key + "=" + value + "\r\n"); 
        } 
        Writer writer = new StringWriter(); 
        PrintWriter pw = new PrintWriter(writer); 
        ex.printStackTrace(pw); 
        Throwable cause = ex.getCause(); 
        // 迴圈著把所有的異常資訊寫入writer中  
        while (cause != null) { 
            cause.printStackTrace(pw); 
            cause = cause.getCause(); 
        } 
        pw.close();// 記得關閉  
        String result = writer.toString(); 
        sb.append(result); 
        // 儲存檔案  
        long timetamp = System.currentTimeMillis(); 
        String time = format.format(new Date());
        String fileName = "crash-" + time + "-" + timetamp + ".log"; 
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) { 
            try {
                File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "Exception"); 
                Log.d("CrashHandler", dir.toString()); 
                if (!dir.exists())
                    dir.mkdir(); 
                FileOutputStream fos = new FileOutputStream(new File(dir, 
                         fileName)); 
                fos.write(sb.toString().getBytes()); 
                fos.close(); 
                return fileName; 
            } catch (FileNotFoundException e) { 
                e.printStackTrace(); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
        } 
        return null; 
    } 
}