MediaNowPlayingView.java revision 7adf7fdd0c2978bb0a87096c89d6356e4e26ad98 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package android.support.v17.leanback.widget;
15
16import android.animation.Animator;
17import android.animation.AnimatorInflater;
18import android.animation.ObjectAnimator;
19import android.content.Context;
20import android.util.AttributeSet;
21import android.view.LayoutInflater;
22import android.view.View;
23import android.widget.ImageView;
24import android.widget.LinearLayout;
25import android.support.v17.leanback.R;
26
27/**
28 * The view displaying 3 animated peak meters next to each other when a media item is playing.
29 */
30public class MediaNowPlayingView extends LinearLayout{
31
32    private final ImageView mImage1;
33    private final ImageView mImage2;
34    private final ImageView mImage3;
35    private final ObjectAnimator mObjectAnimator1;
36    private final ObjectAnimator mObjectAnimator2;
37    private final ObjectAnimator mObjectAnimator3;
38
39    public MediaNowPlayingView(Context context, AttributeSet attrs) {
40        super(context, attrs);
41
42        LayoutInflater.from(context).inflate(R.layout.lb_playback_now_playing_bars, this, true);
43        mImage1 = (ImageView) findViewById(R.id.bar1);
44        mImage2 = (ImageView) findViewById(R.id.bar2);
45        mImage3 = (ImageView) findViewById(R.id.bar3);
46
47        mImage1.setPivotY(mImage1.getDrawable().getIntrinsicHeight());
48        mImage2.setPivotY(mImage2.getDrawable().getIntrinsicHeight());
49        mImage3.setPivotY(mImage3.getDrawable().getIntrinsicHeight());
50
51        setDropScale(mImage1);
52        setDropScale(mImage2);
53        setDropScale(mImage3);
54
55        mObjectAnimator1 = (ObjectAnimator) AnimatorInflater.loadAnimator(context,
56                R.animator.lb_playback_now_bar1_animator);
57        mObjectAnimator1.setTarget(mImage1);
58
59        mObjectAnimator2 = (ObjectAnimator) AnimatorInflater.loadAnimator(context,
60                R.animator.lb_playback_now_bar2_animator);
61        mObjectAnimator2.setTarget(mImage2);
62
63        mObjectAnimator3 = (ObjectAnimator) AnimatorInflater.loadAnimator(context,
64                R.animator.lb_playback_now_bar3_animator);
65        mObjectAnimator3.setTarget(mImage3);
66    }
67
68    static void setDropScale(View view) {
69        view.setScaleY(1f / 12f);
70    }
71
72    @Override
73    public void setVisibility(int visibility) {
74        super.setVisibility(visibility);
75        if (visibility == View.GONE) {
76            stopAnimation();
77        } else {
78            startAnimation();
79        }
80    }
81
82    @Override
83    protected void onAttachedToWindow() {
84        super.onAttachedToWindow();
85        if (getVisibility() == View.VISIBLE)
86            startAnimation();
87    }
88
89    @Override
90    protected void onDetachedFromWindow() {
91        super.onDetachedFromWindow();
92        stopAnimation();
93    }
94
95    private void startAnimation() {
96        startAnimation(mObjectAnimator1);
97        startAnimation(mObjectAnimator2);
98        startAnimation(mObjectAnimator3);
99        mImage1.setVisibility(View.VISIBLE);
100        mImage2.setVisibility(View.VISIBLE);
101        mImage3.setVisibility(View.VISIBLE);
102    }
103
104    private void stopAnimation() {
105        stopAnimation(mObjectAnimator1, mImage1);
106        stopAnimation(mObjectAnimator2, mImage2);
107        stopAnimation(mObjectAnimator3, mImage3);
108        mImage1.setVisibility(View.GONE);
109        mImage2.setVisibility(View.GONE);
110        mImage3.setVisibility(View.GONE);
111    }
112
113    private void startAnimation(Animator animator) {
114        if (!animator.isStarted()) {
115            animator.start();
116        }
117    }
118
119    private void stopAnimation(Animator animator, View view) {
120        if (animator.isStarted()) {
121            animator.cancel();
122            setDropScale(view);
123        }
124    }
125}
126