在此调查中我要实现的是：点击Pictures按钮后，获取手机内所有图片，选择某一个图片，并显示到ImageView中。
应用范围： 图片上传时的图片选择? ， 类似"浏览"。
所有的图片都会列出来，包括目录。
在Activity Action里面有一个“ACTION_GET_CONTENT”字符串常量，该常量让用户选择特定类型的数据，并返回该数据的URI.我们利用该常量，然后设置类型为“image/*”，就可获得Android手机内的所有image。
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main.xml ：
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<?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"?
??? >?
<TextView???
??? android:layout_width="fill_parent"??
??? android:layout_height="wrap_content"??
??? android:text="@string/hello"?
??? />?
?? <Button??
??????? android:id="@+id/b01"?
??????? android:layout_width="fill_parent"??
??????? android:layout_height="wrap_content"??
??? />?
??? <ImageView?
??????? android:id="@+id/iv01"?
??????? android:layout_width="fill_parent"??
??????? android:layout_height="wrap_content"??
???? />?
</LinearLayout>?
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Lesson_01_Pic.Java:
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package com.yfz;?
import java.io.FileNotFoundException;?
import android.app.Activity;?
import android.content.ContentResolver;?
import android.content.Intent;?
import android.graphics.Bitmap;?
import android.graphics.BitmapFactory;?
import android.NET.Uri;?
import android.os.Bundle;?
import android.util.Log;?
import android.view.View;?
import android.widget.Button;?
import android.widget.ImageView;?
public class Lesson_01_Pic extends Activity {?
??? /** Called when the activity is first created. */?
??? @Override?
??? public void onCreate(Bundle savedInstanceState) {?
??????? super.onCreate(savedInstanceState);?
??????? setContentView(R.layout.main);?
?????????
??????? Button button = (Button)findViewById(R.id.b01);?
??????? button.setText("选择图片");?
??????? button.setOnClickListener(new Button.OnClickListener(){?
??????????? @Override?
??????????? public void onClick(View v) {?
??????????????? Intent intent = new Intent();?
??????????????? /* 开启Pictures画面Type设定为image */?
??????????????? intent.setType("image/*");?
??????????????? /* 使用Intent.ACTION_GET_CONTENT这个Action */?
??????????????? intent.setAction(Intent.ACTION_GET_CONTENT);??
??????????????? /* 取得相片后返回本画面 */?
??????????????? startActivityForResult(intent, 1);?
??????????? }?
?????????????
??????? });?
??? }?
?????
??? @Override?
??? protected void onActivityResult(int requestCode, int resultCode, Intent data) {?
??????? if (resultCode == RESULT_OK) {?
??????????? Uri uri = data.getData();?
??????????? Log.e("uri", uri.toString());?
??????????? ContentResolver cr = this.getContentResolver();?
??????????? try {?
??????????????? Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));?
??????????????? ImageView imageView = (ImageView) findViewById(R.id.iv01);?
??????????????? /* 将Bitmap设定到ImageView */?
??????????????? imageView.setImageBitmap(bitmap);?
??????????? } catch (FileNotFoundException e) {?
??????????????? Log.e("Exception", e.getMessage(),e);?
??????????? }?
??????? }?
??????? super.onActivityResult(requestCode, resultCode, data);?
??? }?
}?
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