全局的異常處理器



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;

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.HashMap;
import java.util.Map;

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

public static final String TAG = "CrashHandler";

//系統默認的UncaughtException處理類
private Thread.UncaughtExceptionHandler mDefaultHandler;
//CrashHandler實例
private static CrashHandler INSTANCE = new CrashHandler();
//程序的Context對象
private Context mContext;
//用來存儲設備信息和異常信息
private Map<String, String> infos = new HashMap<String, String>();

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

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

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

/**
* 初始化
*
* @param context
*/
public void init(Context context) {
mContext = context;
//獲取系統默認的UncaughtException處理器
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
//設置該CrashHandler為程序的默認處理器
Thread.setDefaultUncaughtExceptionHandler(this);
}

/**
* 當UncaughtException發生時會轉入該函數來處理
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
if (!handleException(ex) && mDefaultHandler != null) {
//如果用戶沒有處理則讓系統默認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);
}
//退出程序
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
}
}

/**
* 自定義錯誤處理,收集錯誤信息 發送錯誤報告等操作均在此完成.
*
* @param ex
* @return true:如果處理了該異常信息;否則返回false.
*/
private boolean handleException(Throwable ex) {
if (ex == null) {
return false;
}
//使用Toast來顯示異常信息
new Thread() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(mContext, "很抱歉,程序出現異常,即將退出.", Toast.LENGTH_LONG).show();
Looper.loop();
}
}.start();
//收集設備參數信息
// collectDeviceInfo(mContext);
//保存日志文件
saveCrashInfo2File(ex);
return true;
}

/**
* 收集設備參數信息
* @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);
}
}
}

/**
* 保存錯誤信息到文件中
*
* @param ex
* @return 返回文件名稱,便於將文件傳送到服務器
*/
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);

Log.e("===============",sb.toString());

// 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/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;
}
}
 
 
import android.app.Application;import android.content.Context;import com.bbgz.baobeigezi.utils.CrashHandler;/** */public class App extends Application { //App  Context    //Activity、Service Context    //1 全局    //2 生命周期長    public static Context context; @Override public void onCreate() { super.onCreate(); context=this; CrashHandler crashHandler = CrashHandler.getInstance(); crashHandler.init(getApplicationContext()); }}


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