儲存圖像到 SD Card 中

package com.AndroidSaveOnSD;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class AndroidSaveOnSD extends Activity {
 
 ImageView Image;
 Button SaveButton;
 Bitmap bmImage;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Image = (ImageView)findViewById(R.id.image);
     SaveButton = (Button)findViewById(R.id.save);
     
     bmImage = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
     Image.setImageBitmap(bmImage);
     
     SaveButton.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    
    String extStorage = Environment.getExternalStorageDirectory().toString();
    File file = new File(extStorage, "myFile.PNG");
    
    try {
     OutputStream outStream = new FileOutputStream(file);
     bmImage.compress(Bitmap.CompressFormat.PNG, 100, outStream);
     outStream.flush();
        outStream.close();
        Toast.makeText(AndroidSaveOnSD.this, 
          extStorage+"/myFile.PNG", 
          Toast.LENGTH_LONG).show();
    } catch (FileNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
     Toast.makeText(AndroidSaveOnSD.this, 
          e.toString(), 
          Toast.LENGTH_LONG).show();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
     Toast.makeText(AndroidSaveOnSD.this, 
          e.toString(), 
          Toast.LENGTH_LONG).show();
    }
    
   }});
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<ImageView
    android:id="@+id/image"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<Button
    android:id="@+id/save"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Save Image (myFile.PNG)"
    />
</LinearLayout>

注意須修改 AndroidManifest.xml 添加 "android.permission.WRITE_EXTERNAL_STORAGE" 權限.

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