1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:tools="http://schemas.android.com/tools"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent"
6 tools:context="com.example.administrator.jsq.MainActivity"
7 android:orientation="vertical">
8 <!--图片透明-->
9 <SeekBar
10 android:layout_width="match_parent"
11 android:layout_height="wrap_content"
12 android:max="250"
13 android:progress="0"
14 android:id="@+id/sar"/>
15 <ImageView
16 android:layout_width="wrap_content"
17 android:layout_height="wrap_content"
18 android:src="@drawable/f8"
19 android:id="@+id/tp"
20 />
21 </LinearLayout>
1 package com.example.administrator.jsq;
2
3 import android.media.Image;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.util.Log;
7 import android.view.View;
8 import android.widget.ImageView;
9 import android.widget.SeekBar;
10
11 public class MainActivity extends AppCompatActivity {
12 SeekBar sar;
13 ImageView tp;
14
15 @Override
16 protected void onCreate(Bundle savedInstanceState) {
17 super.onCreate(savedInstanceState);
18 setContentView(R.layout.activity_main);
19 sar = (SeekBar)findViewById(R.id.sar);
20 tp = (ImageView)findViewById(R.id.tp);
21 tp.setImageAlpha(0);
22 sar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
23 @Override
24 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
25 tp.setImageAlpha(progress);
26 }
27
28 @Override
29 public void onStartTrackingTouch(SeekBar seekBar) {
30 Log.e("TAG", "进度条开始拖动");
31 }
32
33 @Override
34 public void onStopTrackingTouch(SeekBar seekBar) {
35 Log.e("TAG","进度条停止拖动");
36 }
37 });
38 }
39 }
1 <?xml version="1.0" encoding="utf-8"?>
2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
3 package="com.example.administrator.jsq">
4
5 <application
6 android:allowBackup="true"
7 android:icon="@mipmap/ic_launcher"
8 android:label="@string/app_name"
9 android:supportsRtl="true"
10 android:theme="@style/AppTheme">
11 <activity android:name=".MainActivity">
12 <intent-filter>
13 <action android:name="android.intent.action.MAIN" />
14 <category android:name="android.intent.category.LAUNCHER" />
15 </intent-filter>
16 </activity>
17 </application>
18
19 </manifest>
