程序异常的处理
程序异常终止的处理，强行停止，
UncaughtExceptionHandler接口
程序崩溃处理
| google默认实现是，弹出一个对话框 |
| 如果有try{}catch{}，那么执行这里面的， 如果没有，那么执行 uncaughtException ()里面的处理方式 处理方式一： 在可能出现bug的程序中，设置自定义的异常处理方式 Thread.setDefaultUncaughtExceptionHandler(new MyUncaughtExceptionHandler()); 处理方式二： ①定义一个Application，在onCreate()里面设置默认的异常处理方式 public class MyApp extends Application {
@Override
public void onCreate() {
// super.onCreate();
Thread.setDefaultUncaughtExceptionHandler(new MyUncaughtExceptionHandler());
}
}②自定义的异常处理类 package cn.zengfansheng.exception;
import java.lang.Thread.UncaughtExceptionHandler;
/**
* 我的UncaughtExceptionHandler处理类
* @author hacket
*
*/
public class MyUncaughtExceptionHandler implements UncaughtExceptionHandler {
@Override
public void uncaughtException(Thread thread, Throwable ex) {
System.out.println("我捕获到了异常~~~");
}
} ③然后在uncaughtException()方法，获取应用程序版本，手机硬件信息，错误的堆栈信息， ④提交到服务器上去 ⑤自杀 |
| 完整代码： MyUncaughtExceptionHandler类 package cn.zengfansheng.exception;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
/**
* 我的UncaughtExceptionHandler处理类
* @author hacket
*
*/
public class MyUncaughtExceptionHandler implements UncaughtExceptionHandler {
private Context context;
// 一、单例
// 保证MyUncaughtExceptionHandler只有一个实例
// 1.私有化构造方法
private MyUncaughtExceptionHandler() {
}
// 2.提供一个静态的程序变量
private static MyUncaughtExceptionHandler myUncaughtExceptionHandler;
// 3.暴露出来一个静态的方法 获取myCrashHandler
public static synchronized MyUncaughtExceptionHandler getInstance() {
if (myUncaughtExceptionHandler == null) {
myUncaughtExceptionHandler = new MyUncaughtExceptionHandler();
}
return myUncaughtExceptionHandler;
}
// 二、获取上下文
public void init(Context context) {
this.context = context;
}
// 三、重写uncaughtException()获取信息
@Override
public void uncaughtException(Thread thread, Throwable ex) {
System.out.println("我捕获到了异常~~~");
StringBuilder sb = new StringBuilder();
PackageManager pm = context.getPackageManager();
try {
// 1.获取当前应用程序的版本号.
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.反射获取
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();// 字段名
sb.append(name + " = ");
String value = fields[i].get(null).toString();// 字段所对应的值
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
// TODO 异常信息提交到服务器
} catch (Exception e) {
e.printStackTrace();
}
// 完成自杀的操作
android.os.Process.killProcess(android.os.Process.myPid());
}
} |
| 结果： 02-11 21:03:44.018: I/System.out(26525): 我捕获到了异常~~~ 02-11 21:03:44.038: I/System.out(26525): 程序的版本号为1.0 02-11 21:03:44.038: I/System.out(26525): BOARD = MSM8660_SURF 02-11 21:03:44.038: I/System.out(26525): BOOTLOADER = unknown 02-11 21:03:44.038: I/System.out(26525): BRAND = Xiaomi 02-11 21:03:44.038: I/System.out(26525): CPU_ABI = armeabi-v7a 02-11 21:03:44.038: I/System.out(26525): CPU_ABI2 = armeabi 02-11 21:03:44.038: I/System.out(26525): DEVICE = mione_plus 02-11 21:03:44.038: I/System.out(26525): DISPLAY = JZO54K 02-11 21:03:44.038: I/System.out(26525): FINGERPRINT = Xiaomi/mione_plus/mione_plus:4.1.2/JZO54K/4.1.10:user/release-keys 02-11 21:03:44.038: I/System.out(26525): HARDWARE = qcom 02-11 21:03:44.038: I/System.out(26525): HOST = wcc-miui-ota-bd17 02-11 21:03:44.038: I/System.out(26525): ID = JZO54K 02-11 21:03:44.038: I/System.out(26525): IS_DEBUGGABLE = true 02-11 21:03:44.038: I/System.out(26525): MANUFACTURER = Xiaomi 02-11 21:03:44.038: I/System.out(26525): MODEL = MI 1SC 02-11 21:03:44.038: I/System.out(26525): PRODUCT = mione_plus 02-11 21:03:44.038: I/System.out(26525): RADIO = unknown 02-11 21:03:44.038: I/System.out(26525): SERIAL = f0f02fad 02-11 21:03:44.038: I/System.out(26525): TAGS = release-keys 02-11 21:03:44.038: I/System.out(26525): TIME = 1389262724000 02-11 21:03:44.038: I/System.out(26525): TYPE = user 02-11 21:03:44.038: I/System.out(26525): UNKNOWN = unknown 02-11 21:03:44.038: I/System.out(26525): USER = builder 02-11 21:03:44.038: I/System.out(26525): java.lang.RuntimeException: Unable to start activity ComponentInfo{cn.zengfansheng.exception/cn.zengfansheng.exception.MainActivity}: java.lang.NullPointerException 02-11 21:03:44.038: I/System.out(26525): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2080) 02-11 21:03:44.038: I/System.out(26525): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2105) 02-11 21:03:44.038: I/System.out(26525): at android.app.ActivityThread.access$600(ActivityThread.java:136) 02-11 21:03:44.038: I/System.out(26525): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201) 02-11 21:03:44.038: I/System.out(26525): at android.os.Handler.dispatchMessage(Handler.java:99) 02-11 21:03:44.038: I/System.out(26525): at android.os.Looper.loop(Looper.java:137) 02-11 21:03:44.038: I/System.out(26525): at android.app.ActivityThread.main(ActivityThread.java:4803) 02-11 21:03:44.048: I/System.out(26525): at java.lang.reflect.Method.invokeNative(Native Method) 02-11 21:03:44.048: I/System.out(26525): at java.lang.reflect.Method.invoke(Method.java:511) 02-11 21:03:44.048: I/System.out(26525): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 02-11 21:03:44.048: I/System.out(26525): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) 02-11 21:03:44.048: I/System.out(26525): at dalvik.system.NativeStart.main(Native Method) 02-11 21:03:44.048: I/System.out(26525): Caused by: java.lang.NullPointerException 02-11 21:03:44.048: I/System.out(26525): at cn.zengfansheng.exception.MainActivity.onCreate(MainActivity.java:13) 02-11 21:03:44.048: I/System.out(26525): at android.app.Activity.performCreate(Activity.java:5084) 02-11 21:03:44.048: I/System.out(26525): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 02-11 21:03:44.048: I/System.out(26525): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2044) 02-11 21:03:44.048: I/System.out(26525): ... 11 more |