Intent创建选择器

先在res/drawable-hdpi下准备两张内容一样但大小不同的图片，小的图片名为small，大的图片名为big。

在main.xml中：

<?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:id="@+id/mybut"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/small" />

</LinearLayout>

在主Activity（MyIntentCaseDemo.java）中：

package com.li.intentcaseproject;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.ImageButton;

public class MyIntentCaseDemo extends Activity {

private ImageButton mybut = null;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

super.setContentView(R.layout.main);

this.mybut = (ImageButton) super.findViewById(R.id.mybut);

this.mybut.setOnClickListener(new OnClickListenerImpl());

}

private class OnClickListenerImpl implements OnClickListener {

public void onClick(View v) {

Intent intent = new Intent();

intent.setAction(Intent.ACTION_GET_CONTENT);

intent.setType("image/*");

MyIntentCaseDemo.this.startActivity(Intent.createChooser(intent,

"请选择图片浏览工具"));

//MyIntentCaseDemo.this.startActivity(intent); 可以选择默认打开

}

}

}

在ImageViewActivity.java中：

package com.li.intentcaseproject;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.ImageButton;

import android.widget.ImageView;

public class ImageViewActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

super.setTitle("查看图片") ;

ImageView img = new ImageView(this) ;

img.setImageResource(R.drawable.big) ;

super.setContentView(img) ;

}

}

在AndroidManifest.xml中修改权限：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.li.intentcaseproject"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="15" />

<application android:icon="@drawable/ic_launcher" android:label="@string/app_name">

<activity android:name=".MyIntentCaseDemo"

android:label="@string/app_name">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<activity android:name=".ImageViewActivity">

<intent-filter>

<action android:name="android.intent.action.GET_CONTENT" />

<category android:name="android.intent.category.DEFAULT" />

<category android:name="android.intent.category.OPENABLE" />

<data android:mimeType="image/jpeg" />

</intent-filter>

</activity>

</application>

<uses-permission android:name="android.permission.CALL_PHONE" />

<uses-permission android:name="android.permission.READ_CONTACTS" />

</manifest>