andoid处理未捕获异常
jopen
10年前
在某些意外的情况下，程序崩溃是我们不想看到的，这时我们可以使用未捕获异常，将日志写在文件里，记录错误信息，防止影响用户体验。
package com.home.testuncatch; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import com.home.testuncaughtexception.R; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MyUncaughtExceptionHandler.getInstance().init(); setContentView(R.layout.main); Button btn = (Button) findViewById(R.id.main_btn); btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String a = null; a.length(); } }); } }
MyUncaughtExceptionHandler:
package com.home.testuncatch; import java.io.PrintWriter; import java.io.StringWriter; import java.lang.Thread.UncaughtExceptionHandler; public class MyUncaughtExceptionHandler implements UncaughtExceptionHandler { private static MyUncaughtExceptionHandler instance; public synchronized static MyUncaughtExceptionHandler getInstance() { if (instance == null) { instance = new MyUncaughtExceptionHandler(); } return instance; } public void init() { // 设置当前对象为默认的未捕获异常处理器 Thread.setDefaultUncaughtExceptionHandler(this); } @Override public void uncaughtException(Thread t, Throwable e) { StringWriter stackTrace = new StringWriter(); e.printStackTrace(new PrintWriter(stackTrace)); System.out.println(stackTrace);// 可将错误日志写在文件里 System.exit(10); } }