從 SD Card 中讀取圖像檔案

package com.AndroidLoadFromSD;

import java.io.File;

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 AndroidLoadFromSD extends Activity {
 
 ImageView Image;
 Button LoadButton;
 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);
      LoadButton = (Button)findViewById(R.id.load);
    
      LoadButton.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    
    String extStorage = Environment.getExternalStorageDirectory().toString();
       String file = new File(extStorage, "myFile.PNG").toString();
       Bitmap bm = BitmapFactory.decodeFile(file);
          Image.setImageBitmap(bm);
    
          Toast.makeText(AndroidLoadFromSD.this,
                  extStorage+"/myFile.PNG",
                  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"
  />
<Button
  android:id="@+id/load"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Load Image (myFile.PNG)"
  />
<ImageView
  android:id="@+id/image"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
</LinearLayout>

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