Android進階2之檢索Android的圖片庫並顯示圖片詳細資料

這篇文章，我們將學習如何檢索並顯示媒體庫中的圖片以及每張圖片的詳細資料包括名稱，ID，路徑，大小等等。

關於遊標(cursor)不懂的可以看博文：Android中Cursor類的概念和用法

具體實現：

package xiaosi.photoLibrary;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.provider.MediaStore.Images.Media;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;/** * 該類完成圖片的檢索，顯示功能 *  * @author Administrator *  */public class PhotoLibraryActivity extends Activity implements OnClickListener{private ImageViewphoto;private Buttonnext= null;private Buttonprevious= null;private Buttonmessage= null;private TextViewposition= null;private Cursorcursor;private intphotoIndex;private intphotoNameIndex;private intphotoIDIndex;private intphotoTitleIndex;private intphotoSizeIndex;private StringMessage= null;private inttotalNum= 0;public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);init();}private void init(){next = (Button) findViewById(R.id.next);next.setOnClickListener(this);previous = (Button) findViewById(R.id.previous);previous.setOnClickListener(this);message = (Button) findViewById(R.id.message);message.setOnClickListener(this);photo = (ImageView) this.findViewById(R.id.image_view);position = (TextView) findViewById(R.id.number);// 指定擷取的列String columns[] = new String[] { Media.DATA, Media._ID, Media.TITLE, Media.DISPLAY_NAME, Media.SIZE };// 得到一個遊標cursor = this.getContentResolver().query(Media.EXTERNAL_CONTENT_URI, columns, null, null, null);// 擷取指定列的索引photoIndex = cursor.getColumnIndexOrThrow(Media.DATA);photoNameIndex = cursor.getColumnIndexOrThrow(Media.DISPLAY_NAME);photoIDIndex = cursor.getColumnIndexOrThrow(Media._ID);photoTitleIndex = cursor.getColumnIndexOrThrow(Media.TITLE);photoSizeIndex = cursor.getColumnIndexOrThrow(Media.SIZE);// 擷取圖片總數totalNum = cursor.getCount();// 跳到第一個圖片if (cursor.moveToFirst()){setImage();position.setText("(1/" + totalNum + ")");}}@Overridepublic void onClick(View arg0){switch (arg0.getId()){// 下一個case R.id.next:if (cursor.moveToNext()){setImage();}else{cursor.moveToLast();}break;// 上一個case R.id.previous:if (cursor.moveToPrevious()){setImage();}else{cursor.moveToFirst();}break;case R.id.message:// Dialog顯示詳細資料AlertDialog.Builder builder = new AlertDialog.Builder(PhotoLibraryActivity.this);builder.setTitle("詳細資料");builder.setMessage(Message);builder.setPositiveButton("關閉", new android.content.DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which){dialog.dismiss();}});builder.show();break;}}private void setImage(){// 擷取圖片的NameString name = cursor.getString(photoNameIndex);// 擷取圖片的IDString number = cursor.getString(photoIDIndex);// 擷取圖片的TitleString title = cursor.getString(photoTitleIndex);// 擷取圖片的大小String size = cursor.getString(photoSizeIndex);// 擷取圖片儲存路徑String path = cursor.getString(photoIndex);// 為TextView:position賦值（現在所在的位置）position.setText("(" + number + "/" + totalNum + ")");Message = "Name:" + name + "\n" + "Number:" + number + "\n" + "Title:" + title + "\n" + "Size:" + size + "\n" + "Path:" + path;// 通過路徑擷取圖片Drawable image = Drawable.createFromPath(path);photo.setImageDrawable(image);}}

mian.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="@drawable/background"    android:orientation="vertical" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="50dip"        android:orientation="horizontal" >        <Button            android:id="@+id/next"            android:layout_width="60dip"            android:layout_height="50dip"            android:background="@drawable/next"            android:paddingLeft="30dip" />        <TextView            android:id="@+id/number"            android:layout_width="100dip"            android:layout_height="50dip"            android:paddingLeft="30dip"             android:textColor="#000000"/>        <Button            android:id="@+id/previous"            android:layout_width="60dip"            android:layout_height="50dip"            android:background="@drawable/previous"            android:paddingLeft="30dip" />        <Button            android:id="@+id/message"            android:layout_width="80dip"            android:layout_height="40dip"            android:paddingLeft="30dip"             android:text="詳情"/>    </LinearLayout>    <ImageView        android:id="@+id/image_view"        android:layout_width="fill_parent"        android:layout_height="fill_parent" /></LinearLayout>

一起見證菜鳥的起飛。。。。。。

要全部工程的說一聲。