Android仿酷狗音乐SeekBar——样式篇
2016-10-18 本文已影响3570人
magic5650
Android仿酷狗音乐SeekBar
需求：仿酷狗音乐SeekBar
直接上图，上代码
1903148-676fcbf2e5048392.png
1903148-d3e5ab81fa2acd42.png
** 难点：用户点击或者移动是SeekBar滑块是改变滑块的图案 **
先画两种不同状态的滑块Thumb
平时状态：一个直径为10dp大小的白色的圆
slider_thumb_normal.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<size
android:width="10dp"
android:height="10dp" />
<solid android:color="#ffffffff" />
</shape>
按下状态：一个直径为10dp大小的白色的圆，背景是半透明的直径为40dp的圆
slider_thumb_pressed.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 白色前景 -->
<item android:id="@android:id/secondaryProgress"
android:gravity="center"
android:bottom="15dp"
android:top="15dp"
android:right="15dp"
android:left="15dp">
<shape
android:shape="oval">
<size
android:width="10dp"
android:height="10dp" />
<solid android:color="#ffffffff" />
</shape>
</item>
<!-- 透明阴影 -->
<item android:id="@android:id/background"
android:gravity="center">
<shape
android:shape="oval">
<size
android:height="40dp"
android:width="40dp" />
<solid android:color="#96ffffff" />
</shape>
</item>
</layer-list>
画进度条
(不设置高度,由SeekBar自身控制,SeekBar控件android:layout_height="wrap_content")
play_seekbar_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@android:id/background">
<shape>
<size
android:height="2dp" />
<corners android:radius="5dp"/>
<solid android:color="#88ffffff" />
</shape>
</item>
<item
android:id="@android:id/secondaryProgress">
<clip>
<shape>
<size
android:height="2dp" />
<corners android:radius="5dp"/>
<solid android:color="#88ffffff" />
</shape>
</clip>
</item>
<item android:id="@android:id/progress">
<clip>
<shape>
<size
android:height="2dp"/>
<corners android:radius="5dp"/>
<solid android:color="#ffffffff" />
</shape>
</clip>
</item>
</layer-list>
SeekBar样式xml片段
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp">
<TextView
android:layout_gravity="center"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:id="@+id/seekbar_slider_time"
android:textColor="@color/color_white"
android:textAppearance="?android:attr/textAppearanceMedium"
android:visibility="invisible" />
</LinearLayout>
<LinearLayout
android:id="@+id/seekBar_layout"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:gravity="center_vertical"
android:orientation="horizontal">
<TextView
android:id="@+id/tx_currentTime"
android:layout_width="40dp"
android:layout_height="wrap_content"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/color_white"/>
<SeekBar
android:id="@+id/seedBar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="-20dp"
android:layout_marginEnd="-20dp"
android:paddingStart="28dp"
android:paddingEnd="28dp"
android:background="@android:color/transparent"
android:gravity="center"
android:layout_weight="1"
android:splitTrack="false"
android:maxHeight="2dp"
android:progressDrawable="@drawable/play_seekbar_bg"
android:thumb="@drawable/slider_thumb_normal" />
<TextView
android:id="@+id/tx_maxTime"
android:layout_width="40dp"
android:layout_height="wrap_content"
android:gravity="center"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/color_white"/>
</LinearLayout>
** SeekBar样式关键点 **
- android:maxHeight="2dp"——控制进度条高度
- 设置SeekBar控件边际，以便在滑块变大是可覆盖左右两边的控件，而不会被遮住
android:layout_marginStart="-20dp"
android:layout_marginEnd="-20dp"
android:paddingStart="28dp"
android:paddingEnd="28dp"
- android:splitTrack="false"——控制滑块覆盖在进度条的上面
- android:background="@android:color/transparent"——设置背景透明，去掉滑块变大时的周边光晕
- android:progressDrawable="@drawable/play_seekbar_bg"——默认进度条
- android:thumb="@drawable/slider_thumb_normal"——默认滑块
最关键的地方
使用SeekBar的setThumb方法动态设置滑块
代码
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if(fromUser){
Seekbar_slider_time.setText(updateCurrentTimeText(progress));
}
tx_currentTime.setText(updateCurrentTimeText(progress));
if(progress == seekBar.getMax()){
pauseIcon.setLayoutParams(miss);
playIcon.setLayoutParams(show);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
Log.d(TAG,"onStartTrackingTouch");
isUserPressThumb = true;
Seekbar_slider_time.setVisibility(View.VISIBLE);
//设置seekbarThumb相对位置可大于进度条15，保证thumb在变成40dp直径后可以滑动到进度条最末尾
seekBar.setThumbOffset(15);
seekBar.setThumb(Thumb_pressed);
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
Log.d(TAG,"onStopTrackingTouch");
mi.seekTo(seekBar.getProgress());
seekBar.setThumbOffset(0);
seekBar.setThumb(Thumb_normal);
Seekbar_slider_time.setVisibility(View.INVISIBLE);
isUserPressThumb = false;
}
});
在用户开始按下滑块时onStartTrackingTouch
//设置seekbarThumb相对位置可大于进度条15，保证thumb在变成40dp直径后可以滑动到进度条最末尾
seekBar.setThumbOffset(15);
//改变滑块图案
seekBar.setThumb(Thumb_pressed);
在用户按下滑块结束后onStopTrackingTouch，恢复滑块及seekbar高度
seekBar.setThumbOffset(0);
seekBar.setThumb(Thumb_normal);
* 踩坑过程 *
- 使用selector的xml文件设置SeekBar的android:thumb属性设置滑块 *
play_seekbar_thumb.xml
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:constantSize="false"
android:variablePadding="false">
<item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/slider_thumb_normal" />
<item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/slider_thumb_pressed" />
<item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/slider_thumb_pressed" />
<item android:drawable="@drawable/slider_thumb_normal" />
</selector>
** 坑：有些手机上按下或者移动滑块，滑块是变大了，但是由于SeekBar高度还是原来的，导致滑块被压扁成椭圆 **
