Android进阶2之检索Android的图片库并显示图片详细信息

这篇文章，我们将学习如何检索并显示媒体库中的图片以及每张图片的详细信息包括名称，ID，路径，大小等等。

关于游标(cursor)不懂的可以看博文：Android中Cursor类的概念和用法

具体实现：

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;/** * 该类完成图片的检索，显示功能 * * @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);// 指定获取的列String columns[] = new String[] { Media.DATA, Media._ID, Media.TITLE, Media.DISPLAY_NAME, Media.SIZE };// 得到一个游标cursor = this.getContentResolver().query(Media.EXTERNAL_CONTENT_URI, columns, null, null, null);// 获取指定列的索引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);// 获取图片总数totalNum = cursor.getCount();// 跳到第一个图片if (cursor.moveToFirst()){setImage();position.setText("(1/" + totalNum + ")");}}@Overridepublic void onClick(View arg0){switch (arg0.getId()){// 下一个case R.id.next:if (cursor.moveToNext()){setImage();}else{cursor.moveToLast();}break;// 上一个case R.id.previous:if (cursor.moveToPrevious()){setImage();}else{cursor.moveToFirst();}break;case R.id.message:// Dialog显示详细信息AlertDialog.Builder builder = new AlertDialog.Builder(PhotoLibraryActivity.this);builder.setTitle("详细信息");builder.setMessage(Message);builder.setPositiveButton("关闭", new android.content.DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int which){dialog.dismiss();}});builder.show();break;}}private void setImage(){// 获取图片的NameString name = cursor.getString(photoNameIndex);// 获取图片的IDString number = cursor.getString(photoIDIndex);// 获取图片的TitleString title = cursor.getString(photoTitleIndex);// 获取图片的大小String size = cursor.getString(photoSizeIndex);// 获取图片存储路径String path = cursor.getString(photoIndex);// 为TextView:position赋值（现在所在的位置）position.setText("(" + number + "/" + totalNum + ")");Message = "Name:" + name + "\n" + "Number:" + number + "\n" + "Title:" + title + "\n" + "Size:" + size + "\n" + "Path:" + path;// 通过路径获取图片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="详情"/> </LinearLayout> <ImageView android:id="@+id/image_view" android:layout_width="fill_parent" android:layout_height="fill_parent" /></LinearLayout>

一起见证菜鸟的起飞。。。。。。

要全部工程的说一声。

Android进阶2之检索Android的图片库并显示图片详细信息

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