java android 捕获未处理异常

1. 定义一个异常处理类

public class ExceptionHandler implements Thread.UncaughtExceptionHandler {

    public ExceptionHandler()
    {
        Thread.setDefaultUncaughtExceptionHandler(this);
    }
    
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw, true);
        ex.printStackTrace(pw);
        String errMsg = sw.getBuffer().toString();
        Log.d("未捕获的错误：", errMsg);
        System.out.println(errMsg);
    }
    
}

2. 定义一个App启动程序类，在onCreate方法中注册异常处理类，并在 AndroidManifest.xml 中注册启动程序类。

import android.app.Application;

public class MyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        new ExceptionHandler();
    }
}

<application
    android:name=".MyApp" ... />

3.手动引发一个异常以测试我们的程序。

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        int a = 1;
        int b = 0;
        int c = a/b;
        System.out.println(c);
    }
}