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activity_main

 MainActivity

import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {    private Context mContext;    private Button mButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();    }    private void init(){        mContext=this;        mButton= (Button) findViewById(R.id.button);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(mContext,"点击了Button",Toast.LENGTH_SHORT).show();                mButton.setText("This is a Button");            }        });    }}

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