Gallery的使用(二):显示抓拍的图片

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package com.example.androidtest;import android.os.Bundle;import android.app.Activity;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.provider.MediaStore;import android.provider.MediaStore.Images.Media;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageButton;import android.widget.TextView;public class MainActivity extends Activity {public final static int DISPLAYWIDTH = 200;public final static int DISPLAYHEIGHT = 200;TextView titleTextView;ImageButton imageButton;Cursor cursor;Bitmap bmp;String imageFilePath;int fileColumn;int titleColumn;int displayColumn;public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);titleTextView = (TextView)findViewById(R.id.TitleTextView);imageButton = (ImageButton)findViewById(R.id.ImageButton);String[] columns = {Media.DATA, Media._ID, Media.TITLE, Media.DISPLAY_NAME};cursor = managedQuery(Media.EXTERNAL_CONTENT_URI, columns, null, null, null);fileColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);titleColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.TITLE);displayColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME);if (cursor.moveToFirst()) {titleTextView.setText(cursor.getString(displayColumn));imageFilePath = cursor.getString(fileColumn);bmp = getBitmap(imageFilePath);imageButton.setImageBitmap(bmp);}imageButton.setOnClickListener(new OnClickListener() {public void onClick(View v){if (cursor.moveToNext()) {titleTextView.setText(cursor.getString(displayColumn));imageFilePath = cursor.getString(fileColumn);bmp = getBitmap(imageFilePath);imageButton.setImageBitmap(bmp);}}});}private Bitmap getBitmap(String imageFilePath){BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();bmpFactoryOptions.inJustDecodeBounds = true;Bitmap bmp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);bmpFactoryOptions.inSampleSize = 2;bmpFactoryOptions.inJustDecodeBounds = false;bmp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);return bmp;}}

activity_main.xml:

<?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"    ><ImageButton android:layout_width="wrap_content"              android:layout_height="wrap_content"              android:id="@+id/ImageButton"></ImageButton><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:id="@+id/TitleTextView"    android:text="Image Title"/></LinearLayout>

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