[Android]_ch1.2_按鈕元件onClicl屬性設定

[Android]_ch1.2_按鈕元件onClicl屬性設定



package com.derek.ch0_demo;



import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.TextView;





public class MainActivity extends Activity {

TextView tv1;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        tv1=(TextView)findViewById(R.id.textView1);

     

    }

   

    public void btn1_click(View view){

    tv1.setText("紅色");

    tv1.setBackgroundColor(Color.RED);

    }

public void btn2_click(View view){

    tv1.setText("綠色");

    tv1.setBackgroundColor(Color.GREEN);

}

public void btn3_click(View view){

tv1.setText("藍色");

    tv1.setBackgroundColor(Color.BLUE);

}

public void btn4_click(View view){

tv1.setText("離開");

    finish();

}

}