ProgressBar、SeekBar以及RatingBar的使用

科技 09-07 来源：一起学安卓

一、各自的功能及用途

ProgressBar：进度条，主要向用户展示当前任务的完成进度，例如游戏加载、app更新、文件下载等；

SeekBar：进度条的升级款，与ProgressBar不同的是用户可以自行拖动以控制进度；音量大小、音视频的播放进度等都可以用它实现；

RatingBar：星级评分条，这里我只用三个字描述：“打分的”，多用于电商类app以及各大应用商店，比如对某款app、某件商品评分

二、简单使用

1、打开之前的布局文件activity_main.xml，先删掉之前定义的所有控件，然后再添加今天我们讲到的控件,如图1

图1

2、打开MainActivity.java,因为布局中之前定义的控件已经被删掉，所以代码中也需要清理，不然因为找不到控件id会报错；清掉后定义并绑定今天的控件

public class MainActivity extends AppCompatActivity {

    private ProgressBar pbProgress;
    private SeekBar sbProgress;
    private RatingBar rbEvaluate;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        pbProgress.setProgress(30);

        sbProgress.setMax(100);
        setListener();
    }

    private void setListener() {
        sbProgress.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                Log.e("onProgressChanged======",progress+"");
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
        rbEvaluate.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
            @Override
            public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
                Log.e("onRatingChanged======",rating+"");

            }
        });
    }

    private void initView() {
        rbEvaluate=findViewById(R.id.rb_evaluate);
        pbProgress=findViewById(R.id.pb_progress);
        sbProgress=findViewById(R.id.sb_progress);
    }
}

代码中我用setProgress()方法为pbProgress设置了当前进度

三、官网对于上述控件的属性介绍

1、RatingBar

android:isIndicator	Whether this rating bar is an indicator (and non-changeable by the user).
android:numStars	The number of stars (or rating items) to show.
android:rating	The rating to set by default.
android:stepSize	The step size of the rating.

2、SeekBar

android:thumb

Draws the thumb on a seekbar.

3、ProgressBar

android:animationResolution	Timeout between frames of animation in milliseconds.
android:indeterminate	Allows to enable the indeterminate mode.
android:indeterminateBehavior	Defines how the indeterminate mode should behave when the progress reaches max.
android:indeterminateDrawable	Drawable used for the indeterminate mode.
android:indeterminateDuration	Duration of the indeterminate animation.
android:indeterminateOnly	Restricts to ONLY indeterminate mode (state-keeping progress mode will not work).
android:indeterminateTint	Tint to apply to the indeterminate progress indicator.
android:indeterminateTintMode	Blending mode used to apply the indeterminate progress indicator tint.
android:interpolator	Sets the acceleration curve for the indeterminate animation.
android:max	Defines the maximum value.
android:maxHeight	An optional argument to supply a maximum height for this view.
android:maxWidth	An optional argument to supply a maximum width for this view.
android:min	Defines the minimum value.
android:minHeight
android:minWidth
android:mirrorForRtl	Defines if the associated drawables need to be mirrored when in RTL mode.
android:progress	Defines the default progress value, between 0 and max.
android:progressBackgroundTint	Tint to apply to the progress indicator background.
android:progressBackgroundTintMode	Blending mode used to apply the progress indicator background tint.
android:progressDrawable	Drawable used for the progress mode.
android:progressTint	Tint to apply to the progress indicator.
android:progressTintMode	Blending mode used to apply the progress indicator tint.
android:secondaryProgress	Defines the secondary progress value, between 0 and max.
android:secondaryProgressTint	Tint to apply to the secondary progress indicator.
android:secondaryProgressTintMode	Blending mode used to apply the secondary progress indicator tint.