android加载系统相册图片并显示详解 android加载系统相册图片并显示

1，下载ImageLoad.jar包放入项目libs文件夹中，并点击右键—>add as Library
【android加载系统相册图片并显示详解】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)

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

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; @Overrideprotected 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() {@Overridepublic 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@Overridepublic 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 WebString imageUri = "file:///mnt/sdcard/image.png"; // from SD cardString imageUri = "content://media/external/audio/albumart/13"; // from content providerString imageUri = "assets://image.png"; // from assetsString 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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