[Android]_ch2.8_SeekBar元件(調色盤)

[Android]_ch2.8_SeekBar元件(調色盤)



package com.derek.ch4_seekbar;



import android.R.integer;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.LinearLayout;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

import android.widget.Toast;





public class MainActivity extends Activity {

LinearLayout layout;

TextView tv1;

SeekBar sb1,sb2,sb3;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        sb1=(SeekBar)findViewById(R.id.seekBar1);

        sb2=(SeekBar)findViewById(R.id.seekBar2);

        sb3=(SeekBar)findViewById(R.id.seekBar3);

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

        layout=(LinearLayout)findViewById(R.id.LinearLayout1);

       

        OnSeekBarChangeListener OSBCL=new OnSeekBarChangeListener() {



@Override

public void onStopTrackingTouch(SeekBar seekBar) {

Toast.makeText(MainActivity.this, "3.放開滑桿，值="+seekBar.getProgress(), Toast.LENGTH_SHORT).show();

}



@Override

public void onStartTrackingTouch(SeekBar seekBar) {

Toast.makeText(MainActivity.this, "1.按下滑桿，值="+seekBar.getProgress(), Toast.LENGTH_SHORT).show();

}



@Override

public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {

int red=sb1.getProgress();

int green=sb2.getProgress();

int blue=sb3.getProgress();

tv1.setText("2.調整滑桿..紅="+red+" 綠="+green+" 藍="+blue);

layout.setBackgroundColor(new Color().rgb(red, green, blue));

}

};

sb1.setOnSeekBarChangeListener(OSBCL);

sb2.setOnSeekBarChangeListener(OSBCL);

sb3.setOnSeekBarChangeListener(OSBCL);



    }

}