android加载系统相册图片并显示详解

1,下载ImageLoad.jar包放入项目libs文件夹中,并点击右键—>add as Library

2,首先记得在Manifest.xml注册权限(注:6.0以后的版本要在代码中动态注册权限)

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

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

3,布局文件,一个ImageView用来显示加载的图片,Button点击后进入系统相册选取图片

<?xml version="1.0" encoding="utf-8"?>

<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="com.zcn.demo.loadgallerypicture.MainActivity">

<ImageView

android:id="@+id/pic"

android:src="@mipmap/ic_launcher"

android:layout_width="120dp"

android:layout_height="120dp" />

<Button

android:id="@+id/btn"

android:layout_width="match_parent"

android:layout_height="48dp"

android:layout_gravity="bottom"

android:text="button"/>

</LinearLayout>

4,.java文件

package com.zcn.demo.loadgallerypicture;

import android.Manifest;

import android.annotation.TargetApi;

import android.app.Activity;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.database.Cursor;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.net.Uri;

import android.os.Build;

import android.support.v4.content.ContextCompat;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

import com.nostra13.universalimageloader.core.ImageLoader;

import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

import com.nostra13.universalimageloader.core.assist.QueueProcessingType;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

private static int WRITE_SD_CODE = 1;

private static int READ_SD_CODE = 2;

private static String TAG = "ZCN_MainActivity";

private ImageView image;

private Button btn;

private String pic_path;

private DisplayImageOptions options;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

image = (ImageView)findViewById(R.id.pic);

btn = (Button)findViewById(R.id.btn);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

requestPermission();

}

});

}

//android 6.0 以上版本要手动要求权限

@TargetApi(Build.VERSION_CODES.M)

private void requestPermission() {

if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

this.requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},READ_SD_CODE);

}else {

Log.v(TAG, "6.0一下版本直接打开相册....");

Intent intent = new Intent(Intent.ACTION_PICK,

android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

startActivityForResult(intent, ActivityRequestCode.SHOW_MAP_DEPOT);

}

}

//权限选择结果接收

@Override

public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {

super.onRequestPermissionsResult(requestCode, permissions, grantResults);

if (requestCode == READ_SD_CODE) {

if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

// 用户授予了此权限

// 调用android自带的图库

Intent intent = new Intent(Intent.ACTION_PICK,

android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

startActivityForResult(intent, ActivityRequestCode.SHOW_MAP_DEPOT);

} else {

// 用户拒绝了此权限

}

}

}

public interface ActivityRequestCode {

public static final int SHOW_MAP_DEPOT = 1; //显示Android自带图库,用于选择用户自己的图片

}

public void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if (data != null) {

if (requestCode == ActivityRequestCode.SHOW_MAP_DEPOT

&& resultCode == Activity.RESULT_OK)

showPic(resultCode,data);

}

}

// 调用android自带图库,显示选中的图片

private void showPic(int resultCode,Intent data) {

if(resultCode== Activity.RESULT_OK) {

if (data!=null) {

Uri uri = data.getData();

Log.v(TAG, "uri = "+uri);

if (uri!=null) {

Cursor cursor = getContentResolver().query(uri, null, null, null, null);

//选择的就只是一张图片,所以cursor只有一条记录

if (cursor != null) {

if (cursor.moveToFirst()) {

String path = cursor.getString(cursor.getColumnIndex("_data"));//获取相册路径字段

Log.v(TAG, "打开相册获取的图片sd卡路径:" + path);

File file = new File(path);

initOptions();

ImageLoader.getInstance().displayImage(uri.toString(), image,options);

//保存图片到data/data/files文件夹下

BitmapFactory.Options options = new BitmapFactory.Options();

options.inJustDecodeBounds = true;

Bitmap bitmap = BitmapFactory.decodeFile(path, options);

File f = getFileStreamPath("ic_mine_head_portrait.jpg");

Log.d(TAG, "File path :" + file.getParentFile());

if (!f.exists()) {

Log.d(TAG, "文件不存在");

FileOutputStream out = null;

try{

f.createNewFile();

out = new FileOutputStream(f);

if(bitmap.compress(Bitmap.CompressFormat.PNG, 90, out))

{

out.flush();

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}finally {

try {

out.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

}

}

}

}else{

Log.d(TAG,"放弃从相册选择");

}

}

private void initOptions(){

options = new DisplayImageOptions.Builder().showStubImage(R.mipmap.ic_main_ad_stub) // 设置图片下载期间显示的图片

.showImageForEmptyUri(R.mipmap.ic_main_ad_empty) // 设置图片Uri为空或是错误的时候显示的图片

.showImageOnFail(R.mipmap.ic_main_ad_error) // 设置图片加载或解码过程中发生错误显示的图片

.cacheInMemory(true) // 设置下载的图片是否缓存在内存中

.cacheOnDisc(true) // 设置下载的图片是否缓存在SD卡中

// .displayer(new RoundedBitmapDisplayer(20)) // 设置成圆角图片

.build(); // 创建配置过得DisplayImageOption对象

ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this.getApplicationContext()).defaultDisplayImageOptions(options)

.threadPriority(Thread.NORM_PRIORITY - 2).denyCacheImageMultipleSizesInMemory()

.discCacheFileNameGenerator(new Md5FileNameGenerator()).tasksProcessingOrder(QueueProcessingType.LIFO).build();

ImageLoader.getInstance().init(config);

}

}

后续:显示图片所使用的uri:

String imageUri = "/wp-content/uploads/aaacj/20220116javaicn/271421jgwcqay1ug.png"; // from Web

String imageUri = "file:///mnt/sdcard/image.png"; // from SD card

String imageUri = "content://media/external/audio/albumart/13"; // from content provider

String imageUri = "assets://image.png"; // from assets

String imageUri = "drawable://" + R.drawable.image; // from drawables (only images, non-9patch)

注意:使用drawable://除非你真的需要他。时刻要注意使用本地图片加载方法:setImageResource带代替ImageLoader。

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