android加载系统相册图片并显示详解
作者：596785154
大家好，本篇文章主要讲的是android加载系统相册图片并显示详解，感兴趣的同学赶快来看一看吧，对你有帮助的话记得收藏一下，方便下次浏览
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 = "http://site.com/image.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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