Android Learning-Interface-ui-seekbar

and Processbar almost, but his progress is can be dragged, directly see the effect

Activity_main.xml

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:id= "@+id/linearlayout1"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"android:orientation= "vertical"android:padding= "10DP" >    <TextViewAndroid:id= "@+id/textview1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Change Picture transparency"android:textappearance= "? Android:attr/textappearancelarge" />    <SeekBarAndroid:id= "@+id/seekbar1"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:max= "255"android:progress= "255"Android:thumb= "@drawable/ic_launcher"         />    <ImageViewAndroid:id= "@+id/imageview1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:src= "@drawable/pic1" /></LinearLayout>

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Mainactivity.java

 Public classMainactivityextendsactivity{SeekBar seekBar1;        ImageView ImageView1; Handler Handler=NewHandler () { Public voidhandlemessage (Message msg) {if(msg.what==123){                intAlpha =msg.getdata (). GETINT ("Alpha");            Imageview1.setimagealpha (Alpha);    }        }    }; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);                Setcontentview (R.layout.activity_main); ImageView1=(ImageView) Findviewbyid (R.ID.IMAGEVIEW1); SeekBar1=(SeekBar) Findviewbyid (R.ID.SEEKBAR1); Seekbar1.setonseekbarchangelistener (NewOnseekbarchangelistener () {@Override Public voidOnstoptrackingtouch (SeekBar SeekBar) {//TODO Auto-generated method stubs} @Override Public voidOnstarttrackingtouch (SeekBar SeekBar) {//TODO Auto-generated method stubs} @Override Public voidOnprogresschanged (SeekBar SeekBar,intProgress,BooleanFromuser) {Message msg=NewMessage (); Msg.what=123; Bundle Data=NewBundle (); Data.putint ("Alpha", progress);                Msg.setdata (data);                            Handler.sendmessage (msg);    }        }); }}

View Code

Android Learning-Interface-ui-seekbar