1.自定义一个类(MaApp)继承Application
2.在清单文件中的Application选项菜单对应的name属性中添加MyApp
3.重写application中的onCreate方法
4.自定义一个类(MyCrashHandler) 实现UncaughtExceptionHandler实现其中的uncaughtException方法
5.将MyCrashHandler 采用单例设计模式 加入同步代码块
6.在MyApp类中的主线程把这个异常捕获设置进去
1 Thread.currentThread().setUncaughtExceptionHandler(MyCrashHandler.getInstance(getApplicationContext()));
7.异常的处理在MyCrashHandler中的uncaughtException中处理
上代码
MyApp类
1 package cn.itcast.crash;
2
3 import java.lang.Thread.UncaughtExceptionHandler;
4
5 import android.app.Application;
6
7 public class MyApp extends Application {
8
9
10 /**
11 * 应用程序 的进程在第一次被创建的时候 执行的方法
12 */
13 @Override
14 public void onCreate() {
15
16 Thread.currentThread().setUncaughtExceptionHandler(MyCrashHandler.getInstance(getApplicationContext()));
17
18
19
20 super.onCreate();
21 }
22
23
24
25 }
MyCrashHandler类
1 package cn.itcast.crash;
2
3 import java.io.File;
4 import java.io.FileOutputStream;
5 import java.io.PrintWriter;
6 import java.io.StringWriter;
7 import java.lang.Thread.UncaughtExceptionHandler;
8 import java.lang.reflect.Field;
9
10 import android.content.Context;
11 import android.content.pm.PackageInfo;
12 import android.os.Build;
13 import android.os.Environment;
14
15 public class MyCrashHandler implements UncaughtExceptionHandler {
16 private MyCrashHandler() {
17 };
18 private static UncaughtExceptionHandler defaultHandler;
19 //定义一个系统的默认的异常处理的handler
20 private static MyCrashHandler myCrashHandler;
21 private static Context mContext;
22
23 public synchronized static MyCrashHandler getInstance(Context context) {
24 if (myCrashHandler == null) {
25 myCrashHandler = new MyCrashHandler();
26 mContext = context;
27 defaultHandler = Thread.currentThread().getDefaultUncaughtExceptionHandler();
28 }
29 return myCrashHandler;
30 }
31
32 /**
33 * 当某一个异常 没有代码显示的捕获的时候, 系统会调用 默认的异常处理的代码 处理这个异常
34 */
35 @Override
36 public void uncaughtException(Thread thread, Throwable ex) {
37 System.out.println("出现了异常,但是被哥捕获了");
38 StringWriter wr = new StringWriter();
39 PrintWriter pw = new PrintWriter(wr);
40 ex.printStackTrace(pw);
41 StringBuilder sb = new StringBuilder();
42
43 try {
44 PackageInfo packinfo = mContext.getPackageManager().getPackageInfo(
45 mContext.getPackageName(), 0);
46 String version = packinfo.versionName;
47 sb.append("错误信息:\n");
48 sb.append("版本号:" + version + "\n");
49
50 String errorlog = wr.toString();
51 sb.append(errorlog);
52 sb.append("\n");
53
54 // 获取当前手机操作系统的信息.
55 Field[] fields = Build.class.getDeclaredFields();
56 for (Field field : fields) {
57 field.setAccessible(true);// 暴力反射,可以获取私有成员变量的信息
58 String name = field.getName();
59 String value = field.get(null).toString();
60 sb.append(name+"="+value+"\n");
61 }
62 String time ="time:"+ System.currentTimeMillis();
63 sb.append(time);
64 String log = sb.toString();
65 File file = new File(Environment.getExternalStorageDirectory(),"error.log");
66 FileOutputStream fos = new FileOutputStream(file);
67 fos.write(log.getBytes());
68 fos.flush();
69 fos.close();
70
71 android.os.Process.killProcess(android.os.Process.myPid());
72 //调用系统的默认的异常处理方法 处理这个异常
73 defaultHandler.uncaughtException(thread, ex);
74
75 } catch (Exception e) {
76 e.printStackTrace();
77 }
78
79 }
80
81 }