[Android] Background not full

New application:
Target SDK: API17: Adndroid4.2
Compile With: API18: Android4.3
Theme: Holo Light with Dark Actior Bar

in the code set a 320 * 480 map as the background , on the drawable-mdpi directory.


same code with the picture in the book project with code to run after full normal display.
I built a project where it is not full-screen on the right is below a black border , not full screen.
personal feeling is that a relationship with the SDK version . My adt version is 20130729 . Downloaded from the official website :
adt-bundle-windows-x86-20130729.

get a long time, been able to find the reasons .
First, be sure not the code thing.
------ Solution ---------------------------------------- ----
canvas.drawBitmap (bmpBg, 0, 0, paint);
==>
canvas.drawBitmap (bmpBg, null, new RectF (0, 0, w, h), paint);
----- - eference ---------------------------------------
code with the view put screenshot look
------ eference ---------------------------------------

package com.example.zbgtest;
  
  
  import android.content.Context;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Paint;
  import android.view.SurfaceHolder;
  import android.view.SurfaceHolder.Callback;
  import android.view.SurfaceView;
  
  public class mySur extends SurfaceView implements Callback{
  	private Canvas canvas;
  	private Paint paint;
  	private SurfaceHolder holder;
  	private boolean flag;
  	private Bitmap bmpBg;
  	private MyThread th_draw;
  	
  	public mySur(Context context) {
  		super(context);
  		// TODO Auto-generated constructor stub
  		flag = true;
  		holder = getHolder();
  		holder.addCallback(this);
  		paint = new Paint();
  		paint.setColor(Color.WHITE);
  		bmpBg = BitmapFactory.decodeResource(this.getResources(), R.drawable.menu);
  	}
  
  	public void logic(){
  		
  	}
  	public void reallyDraw(){
  		canvas.drawBitmap(bmpBg, 0, 0, paint);
  	}
  	
  	public void draw(){
  		try{
  			canvas = holder.lockCanvas();
  			if(canvas != null){
  				reallyDraw();
  			}
  		}catch(Exception e){
  			
  		}finally{
  			if(canvas != null){
  				holder.unlockCanvasAndPost(canvas);
  			}
  		}
  	}
  	
  	class MyThread extends Thread{
  		private int time;
  		
  		public MyThread(int time){
  			this.time = time;
  		}
  		
  		@Override
  		public void run(){
  			while(flag){
  				try {
  					draw();
  					logic();
  					
  					Thread.sleep(time);
  				} catch (InterruptedException e) {
  					// TODO Auto-generated catch block
  					e.printStackTrace();
  				}
  			}
  		}
  	}
  	
  	
  	
  	@Override
  	public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
  		// TODO Auto-generated method stub
  		th_draw = new MyThread(50);
  		th_draw.start();
  	}
  
  
  	@Override
  	public void surfaceCreated(SurfaceHolder arg0) {
  		// TODO Auto-generated method stub
  		
  	}
  
  
  	@Override
  	public void surfaceDestroyed(SurfaceHolder arg0) {
  		// TODO Auto-generated method stub
  		flag = false;
  	}
  
  
  
  
      
  }

package com.example.zbgtest;
  
  import android.os.Bundle;
  import android.app.Activity;
  import android.view.Menu;
  
  public class MainActivity extends Activity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(new mySur(this));
      }
  
  
  
      
  }

<?xml version="1.0" encoding="utf-8"?>
  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.example.zbgtest"
      android:versionCode="1"
      android:versionName="1.0" >
  
      <uses-sdk
          android:minSdkVersion="8"
          android:targetSdkVersion="17" />
  
      <application
          android:allowBackup="true"
          android:icon="@drawable/ic_launcher"
          android:label="@string/app_name"
          android:theme="@android:style/Theme.NoTitleBar.Fullscreen" 
          >
          <activity
              android:name="com.example.zbgtest.MainActivity"
              android:label="@string/app_name" >
              <intent-filter>
                  <action android:name="android.intent.action.MAIN" />
  
                  <category android:name="android.intent.category.LAUNCHER" />
              </intent-filter>
          </activity>
      </application>
  
  </manifest>

------ eference ------------------------------------ ---
If you simulator resolution is 320 * 480 , it should be no black edges .
If other resolutions , the background map will proportionally enlarged or reduced , but without stretching , so that may have black edges .
estimated that you are using a 480 * 800 resolution , pictures, etc. After scaling , black bars will appear at the bottom .
------ eference --------------------------------------- < br> I also own android phone tried, with my own code will have black bars , and replaced with code that comes with the book is full screen ,
picture is the same one ah ~
Also I put the above code into the code works in the book , but also the full screen .
can run my own works is a black border ...
------ eference ----------------------- ----------------
my eclipse, ADT new project step screenshot:





help us to see .
------ eference --------------------------------------- < br> Oh , dpi issue. A different picture in the same dpi resolution display on the phone is not the same . You put the picture on the hdpi directory try.
------ eference --------------------------------------- < br>

------ eference ------------------------------------ ---
drawable-ldpi, mdpi, hdpi have tried,
on ldpi below shows the effect will be beyond the screen .
placed hdpi Now, with the above shown smaller than the display .
placed mdpi Below, is the above effect.
------ eference --------------------------------------- < br>
------ eference ---------------------------------------
10 floor , too thanks , already full .
------ eference - --------------------------------------
Also , who knows the reasons for the above problem where is it ?