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>