Android的SeekBar和RateBar的使用-android學習之旅（三十二）

SeekBar簡介

SeekBar允許用戶拖動，進行調節經常用於音量調節等方面。
android：thumb設置drawable對象來表示拖動的物體。
setOnSeekBarChangeListener（）設置SeekBar的改變。

代碼示例

package peng.liu.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.SeekBar;


public class MainActivity extends Activity {
    private ImageView image;
    private SeekBar seekBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        image = (ImageView) findViewById(R.id.image);
        seekBar = (SeekBar) findViewById(R.id.seekBar);
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                image.setAlpha(i);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }
}

布局代碼

效果圖

RatingBar簡介

RatingBar是一個星級評分條，它和SeekBar有著相同的父類AbsSeekBar，因此屬性相似。

RatingBar屬性

代碼示例

package peng.liu.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.SeekBar;


public class MainActivity extends Activity {
    private ImageView image;
    private RatingBar ratingBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        image = (ImageView) findViewById(R.id.image);
        ratingBar = (RatingBar) findViewById(R.id.ratingBar);
        ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
            @Override
            public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
                image.setAlpha(v*255/5);
            }
        });
    }
}

效果圖