package com.example.androidimageview;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
TextView textTitle;
ImageView image1, image2, image3;
SeekBar opacityBar, backgroundOpacityBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textTitle = (TextView)findViewById(R.id.title);
image1 = (ImageView)findViewById(R.id.image1);
image2 = (ImageView)findViewById(R.id.image2);
image3 = (ImageView)findViewById(R.id.image3);
opacityBar = (SeekBar)findViewById(R.id.opacity);
backgroundOpacityBar = (SeekBar)findViewById(R.id.backgroundopacity);
image1.setBackgroundColor(0xFFff0000);
image2.setBackgroundColor(0xFFff0000);
image3.setBackgroundColor(0xFFff0000);
opacityBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
//setAlpha (float alpha)
//alpha between 0 and 1
textTitle.setAlpha((float)progress/255);
image1.setAlpha((float)progress/255);
//setAlpha (int alpha) deprecated in API level 16.
image2.setAlpha(progress);
//require API level 16
image3.setImageAlpha(progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}});
backgroundOpacityBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
int backgroundOpacity = progress * 0x01000000;
image1.setBackgroundColor(backgroundOpacity + 0xff0000);
image2.setBackgroundColor(backgroundOpacity + 0xff0000);
image3.setBackgroundColor(backgroundOpacity + 0xff0000);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}});
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.androidimageview.MainActivity" >
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<SeekBar
android:id="@+id/opacity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="255" />
<SeekBar
android:id="@+id/backgroundopacity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="255" />
<ImageView
android:id="@+id/image1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />
<ImageView
android:id="@+id/image2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />
<ImageView
android:id="@+id/image3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />
</LinearLayout>
Next:
- Colorize ImageView, using setColorFilter()
No comments:
Post a Comment