从Gallery中获取图片示例

一、MainActivity类

package com.example.gallerydemo;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends Activity {

    private ImageView iv;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv=(ImageView) findViewById(R.id.iv);
    }

    public void selectImage(View view) {
        Intent intent=new Intent();
        intent.setAction(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, 0);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        if (data != null) {
            Uri uri=data.getData();//图片的uri路径
            iv.setImageURI(uri);
            //缩略图 Bitmap bitmap=data.getParcelableExtra("data");
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
    
}

二、layout/activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >
    <Button 
        android:onClick="selectImage"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="显示一张图片"
        />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>