Android获取图片资源中的某一张图片并显示的Demo

1.xml布局文件代码

  

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context=".DemoGetImage" >
 6     <Button 
 7         android:id="@+id/mybutton"
 8         android:layout_width="wrap_content"
 9         android:layout_height="wrap_content"
10         android:layout_centerHorizontal="true"
11         android:text="选择图片"/>
12 
13     <ImageView 
14         android:id="@+id/myimageview"
15         android:layout_centerHorizontal="true"
16         android:layout_width="200dip"
17         android:layout_height="200dip"
18         android:scaleType="centerInside"
19         android:layout_below="@id/mybutton"/>
20     
21 </RelativeLayout> 

2Activity文件

  

package com.example.demogetimage;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class DemoGetImage extends Activity {
    public Button mybutton = null;
    public ImageView myimageview = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo_get_image);
        mybutton = (Button)findViewById(R.id.mybutton);
        myimageview = (ImageView)findViewById(R.id.myimageview);
        mybutton.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(intent.ACTION_GET_CONTENT);
                startActivityForResult(intent, 1);
            }
        });
        
    }
    public void onActivityResult(int requestCode, int resultCode, Intent data){
        if(RESULT_OK==resultCode){
            Uri uri = data.getData();
            ContentResolver cr = this.getContentResolver();
            try {
                Bitmap bm = BitmapFactory.decodeStream(cr.openInputStream(uri));
                myimageview.setImageBitmap(bm);
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_demo_get_image, menu);
        return true;
    }

}

标黄色字体的代码是关键：

                Intent intent = new Intent();//新建Intent
                //打开Pictures画面Type为image/*
                intent.setType("image/*");
                intent.setAction(intent.ACTION_GET_CONTENT);
                startActivityForResult(intent, 1);