android　SDカードの画像を背景にタイル表示する

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
   <ImageView
      android:id="@+id/imageView1"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:scaleType="center"
   />

   <LinearLayout
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:orientation="vertical" >

      <Button
         android:id="@+id/button1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Button" />


   </LinearLayout>

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="tile.mode.namespace"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".TileModeActivity"
            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>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    
</manifest>

package tile.mode.namespace;

import java.io.File;
import java.io.FileOutputStream;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class TileModeActivity extends Activity {

	Button button1;
	boolean btyp=true;
	String path1;
	ImageView imageView1;
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        saveBitmapToSd();//SDカードに画像ファイルをコピー
        
        imageView1 = (ImageView)findViewById(R.id.imageView1);
        imageView1.setBackgroundColor(Color.BLUE);
    	path1 = Environment.getExternalStorageDirectory().getPath()+"/TileMode.png";
    	button1=(Button)findViewById(R.id.button1);
    	button1.setOnClickListener(new OnClickListener(){
			public void onClick(View arg0) {
				if(btyp){//タイル表示
			    	try{
			    	    BitmapDrawable bmpDrawer =(BitmapDrawable) Drawable.createFromPath(path1);
			            bmpDrawer.setTileModeXY(TileMode.REPEAT, TileMode.REPEAT);
			            imageView1.setBackgroundDrawable(bmpDrawer);
				    imageView1.setImageBitmap(null);
			    	}
			    	catch(Exception e){Log.d("Error",e.toString());}
					
				}
				else{//拡大表示
			    	try{
			            imageView1.setScaleType(ScaleType.CENTER_CROP);
			            Bitmap bitmap = BitmapFactory.decodeFile(path1);
				    imageView1.setImageBitmap(bitmap);
			            imageView1.setBackgroundDrawable(null);
			    	}
			    	catch(Exception e){Log.d("Error",e.toString());}
					
				}
				btyp=!btyp;
			}});
    }

	//使用する画像をSDカードに保存する
	public void saveBitmapToSd() {
		try {
	        PackageManager pm = getPackageManager(); 
	        ResolveInfo appData=pm.resolveActivity(getIntent(), 0);
	        Drawable appIcon = appData.loadIcon(pm);
	        
	        Bitmap mBitmap=((BitmapDrawable) appIcon).getBitmap();
	        // sdcardフォルダを指定
	        File root = Environment.getExternalStorageDirectory();
	        // 保存処理開始
	        FileOutputStream fos = null;
	        fos = new FileOutputStream(new File(root, "TileMode.png"));
	        // PNGで保存
	        mBitmap.compress(CompressFormat.PNG, 100, fos);
	        // 保存処理終了
	        fos.close();
		} catch (Exception e) {
		Log.e("Error", "" + e.toString());
		}
	}
	
}