全局异常捕获

新建一个App类

一定要在清单文件注册

package com.example.am;

import android.app.Application;
import android.widget.Toast;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;

public class App extends Application implements Thread.UncaughtExceptionHandler{
    @Override
    public void onCreate() {
        super.onCreate();
        //进行异常捕获
        Thread.setDefaultUncaughtExceptionHandler(this);
    }
    @Override
    public void uncaughtException(Thread thread, Throwable throwable) {
        //进行日志打印
       Writer writer =  new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        throwable.printStackTrace(printWriter);
        Toast.makeText(this,"凉了",Toast.LENGTH_LONG).show();
    }
}
//activity文件

package com.example.am;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class TwoActivity extends AppCompatActivity implements View.OnClickListener {
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_two);
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

            String name = null;
            boolean status = name.equals("周扒皮");
            Log.e("dgsdg","status"+status);
        }
    }