程序中的异常处理(自定义UncaughtExceptionHandler)

1.  继承Application  重写onCreate() 方法

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public class MyApp extends Application {        //在整个应用第一次被创建出来的时候 执行      // 在应用程序对应的进程 第一次创建出来的时候执行      @Override     public void onCreate() {         super.onCreate();         //把自定义的异常处理类设置 给主线程          MyCrashHandler myCrashHandler = MyCrashHandler.getInstance();         myCrashHandler.init(getApplicationContext());         Thread.currentThread().setUncaughtExceptionHandler(myCrashHandler);     } }

2.  修改清单文件android:label="@string/app_name" android:name="MyApp">

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<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="cn.itcast.crash"     android:versionCode="1"     android:versionName="1.0" >        <uses-sdk android:minSdkVersion="8" />        <application         android:icon="@drawable/ic_launcher"         android:label="@string/app_name" android:name="MyApp">         <activity             android:label="@string/app_name"             android:name=".CrashActivity" >             <intent-filter >                 <action android:name="android.intent.action.MAIN" />                    <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application>    </manifest>

3. 实现UncaughtExceptionHandler 类

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public class MyCrashHandler implements UncaughtExceptionHandler {     // 保证MyCrashHandler只有一个实例     // 2.提供一个静态的程序变量     private static MyCrashHandler myCrashHandler;     private Context context;        // 1.私有化构造方法     private MyCrashHandler() {        }        // 3.暴露出来一个静态的方法 获取myCrashHandler        public static synchronized MyCrashHandler getInstance() {         if (myCrashHandler == null) {             myCrashHandler = new MyCrashHandler();         }         return myCrashHandler;     }        public void init(Context context) {         this.context = context;     }        // 程序发生异常的时候调用的方法     // try catch        @Override     public void uncaughtException(Thread thread, Throwable ex) {         System.out.println("出现错误啦 哈哈");         StringBuilder sb = new StringBuilder();         // 1.获取当前应用程序的版本号.         PackageManager pm = context.getPackageManager();         try {             PackageInfo packinfo = pm.getPackageInfo(context.getPackageName(),                     0);             sb.append("程序的版本号为" + packinfo.versionName);             sb.append("\n");                // 2.获取手机的硬件信息.             Field[] fields = Build.class.getDeclaredFields();             for (int i = 0; i < fields.length; i++) {                 // 暴力反射,获取私有的字段信息                 fields[i].setAccessible(true);                 String name = fields[i].getName();                 sb.append(name + " = ");                 String value = fields[i].get(null).toString();                 sb.append(value);                 sb.append("\n");             }             // 3.获取程序错误的堆栈信息 .             StringWriter writer = new StringWriter();             PrintWriter printWriter = new PrintWriter(writer);             ex.printStackTrace(printWriter);                            String result = writer.toString();             sb.append(result);                                           System.out.println(sb.toString());                // 4.把错误信息 提交到服务器                        } catch (Exception e) {             e.printStackTrace();         }            // 完成自杀的操作         android.os.Process.killProcess(android.os.Process.myPid());     }    }

 

 

 

 

 

 

 

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