xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/chuanzhang"
android:id="@+id/iv"
/>
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/sbr"
android:max="255"
android:progress="255"
/>
</LinearLayout>
java
package com.example.chenshuai.test322;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.SeekBar;
/**
* Created by chenshuai on 2016/3/30.
*/
public class Tutou extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.touminggundonglayout);
final ImageView imageView = (ImageView)findViewById(R.id.iv);
final SeekBar sk_1 = (SeekBar)findViewById(R.id.sbr);
sk_1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
imageView.setImageAlpha(progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
}
![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLicGcq5yMzMzNwADMyETMtIzM4YTM2UzMyAzMzAjNxAjMtQzN1gDN48CXzAjNxAjMvwFN3UDO0gzLcd2bsJ2Lc12bj5ycn9Gbi52YuUTMwIzcldWYtl2Lc9CX6MHc0RHaiojIsJye.jpg)
转载于:https://www.cnblogs.com/Chenshuai7/p/5339527.html