Android—图片相册选择和相机拍照
星光不负赶路人，时间不负有心人
文章目录
Android---图片相册选择和相机拍照效果获取权限，导入依赖危险权限和普通权限获取权限的案例读取用户相册点击事件读取相册效果
获取权限，导入依赖
// 图片选择控件implementation 'io.github.lucksiege:pictureselector:v2.7.2'// 让用户同意权限的弹窗如何调出来呢，我们使用第三方开源控件implementation 'com.yanzhenjie:permission:2.0.3'// 网络图片的加载implementation 'com.github.bumptech.glide:glide:4.12.0'
增加文件读写的权限第三个是照相机的权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.CAMERA" />android:requestLegacyExternalStorage="true"
文件的读写权限和我们以前学习的网络权限等等有些区别，它属于危险权限
危险权限和普通权限
从 Android6.0 开始，Google调整了应用的权限申请方案。调整之后将权限分级，分成了普通权限和危险权限普通权限的授权方式跟之前一样，只需要在 Manifest 文件中申明即可
危险权限不仅需要在 Manifest 文件中声明，还需要在程序中调用官方提供的Api主动申请
危险权限有如下九种：读取联系人；打电话；读取用户日历信息；相机权限；传感器，获取用户位置；读取用户SD卡（拍的照片视频都在这里）；多媒体（录音）；短信。
获取权限的案例
AndPermission.with(this).runtime().permission(Permission.WRITE_EXTERNAL_STORAGE, Permission.CAMERA).onGranted(permissions -> {Toast.makeText(MainActivity2.this, "授权成功！", Toast.LENGTH_SHORT).show();}).onDenied(permissions -> {//用户拒绝->强制退出appToast.makeText(MainActivity2.this, "未获取权限不能使用本app！", Toast.LENGTH_SHORT).show();System.exit(0);}).start();
如果用户不允许以上权限，用户拒绝，市面上大多数APP则会直接退出。
读取用户相册
建GlideEngine.java类
官方代码，直接使用
package com.huncm.xiaotang;import android.content.Context;import android.graphics.Bitmap;import android.graphics.PointF;import android.graphics.drawable.Drawable;import android.view.View;import android.widget.ImageView;import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.core.graphics.drawable.RoundedBitmapDrawable;import androidx.core.graphics.drawable.RoundedBitmapDrawableFactory;import com.bumptech.glide.Glide;import com.bumptech.glide.request.target.BitmapImageViewTarget;import com.bumptech.glide.request.target.ImageViewTarget;import com.luck.picture.lib.engine.ImageEngine;import com.luck.picture.lib.listener.OnImageCompleteCallback;import com.luck.picture.lib.tools.MediaUtils;import com.luck.picture.lib.widget.longimage.ImageSource;import com.luck.picture.lib.widget.longimage.ImageViewState;import com.luck.picture.lib.widget.longimage.SubsamplingScaleImageView;public class GlideEngine implements ImageEngine {/*** 加载图片** @param context* @param url* @param imageView*/@Overridepublic void loadImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {Glide.with(context).load(url).into(imageView);}/*** 加载网络图片适配长图方案* # 注意：此方法只有加载网络图片才会回调** @param context* @param url* @param imageView* @param longImageView* @param callback网络图片加载回调监听 {link after version 2.5.1 Please use the #OnImageCompleteCallback#}*/@Overridepublic void loadImage(@NonNull Context context, @NonNull String url,@NonNull ImageView imageView,SubsamplingScaleImageView longImageView, OnImageCompleteCallback callback) {Glide.with(context).asBitmap().load(url).into(new ImageViewTarget<Bitmap>(imageView) {@Overridepublic void onLoadStarted(@Nullable Drawable placeholder) {super.onLoadStarted(placeholder);if (callback != null) {callback.onShowLoading();}}@Overridepublic void onLoadFailed(@Nullable Drawable errorDrawable) {super.onLoadFailed(errorDrawable);if (callback != null) {callback.onHideLoading();}}@Overrideprotected void setResource(@Nullable Bitmap resource) {if (callback != null) {callback.onHideLoading();}if (resource != null) {boolean eqLongImage = MediaUtils.isLongImg(resource.getWidth(),resource.getHeight());longImageView.setVisibility(eqLongImage ? View.VISIBLE : View.GONE);imageView.setVisibility(eqLongImage ? View.GONE : View.VISIBLE);if (eqLongImage) {// 加载长图longImageView.setQuickScaleEnabled(true);longImageView.setZoomEnabled(true);longImageView.setDoubleTapZoomDuration(100);longImageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP);longImageView.setDoubleTapZoomDpi(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER);longImageView.setImage(ImageSource.bitmap(resource),new ImageViewState(0, new PointF(0, 0), 0));} else {// 普通图片imageView.setImageBitmap(resource);}}}});}/*** 加载网络图片适配长图方案* # 注意：此方法只有加载网络图片才会回调** @param context* @param url* @param imageView* @param longImageView* @ 已废弃*/@Overridepublic void loadImage(@NonNull Context context, @NonNull String url,@NonNull ImageView imageView,SubsamplingScaleImageView longImageView) {Glide.with(context).asBitmap().load(url).into(new ImageViewTarget<Bitmap>(imageView) {@Overrideprotected void setResource(@Nullable Bitmap resource) {if (resource != null) {boolean eqLongImage = MediaUtils.isLongImg(resource.getWidth(),resource.getHeight());longImageView.setVisibility(eqLongImage ? View.VISIBLE : View.GONE);imageView.setVisibility(eqLongImage ? View.GONE : View.VISIBLE);if (eqLongImage) {// 加载长图longImageView.setQuickScaleEnabled(true);longImageView.setZoomEnabled(true);longImageView.setDoubleTapZoomDuration(100);longImageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP);longImageView.setDoubleTapZoomDpi(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER);longImageView.setImage(ImageSource.bitmap(resource),new ImageViewState(0, new PointF(0, 0), 0));} else {// 普通图片imageView.setImageBitmap(resource);}}}});}/*** 加载相册目录** @param context 上下文* @param url 图片路径* @param imageView 承载图片ImageView*/@Overridepublic void loadFolderImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {Glide.with(context).asBitmap().load(url).override(180, 180).centerCrop().sizeMultiplier(0.5f).placeholder(R.drawable.picture_image_placeholder).into(new BitmapImageViewTarget(imageView) {@Overrideprotected void setResource(Bitmap resource) {RoundedBitmapDrawable circularBitmapDrawable =RoundedBitmapDrawableFactory.create(context.getResources(), resource);circularBitmapDrawable.setCornerRadius(8);imageView.setImageDrawable(circularBitmapDrawable);}});}/*** 加载gif** @param context 上下文* @param url 图片路径* @param imageView 承载图片ImageView*/@Overridepublic void loadAsGifImage(@NonNull Context context, @NonNull String url,@NonNull ImageView imageView) {Glide.with(context).asGif().load(url).into(imageView);}/*** 加载图片列表图片** @param context 上下文* @param url 图片路径* @param imageView 承载图片ImageView*/@Overridepublic void loadGridImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {Glide.with(context).load(url).override(200, 200).centerCrop().placeholder(R.drawable.picture_image_placeholder).into(imageView);}private GlideEngine() {}private static GlideEngine instance;public static GlideEngine createGlideEngine() {if (null == instance) {synchronized (GlideEngine.class) {if (null == instance) {instance = new GlideEngine();}}}return instance;}}
点击事件读取相册
ImageView imageView = findViewById(R.id.imageViewhjc);findViewById(R.id.buttonhjc).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {PictureSelector.create(MainActivity.this).openGallery(PictureMimeType.ofAll()).imageEngine(GlideEngine.createGlideEngine()).forResult(new OnResultCallbackListener<LocalMedia>() {@Overridepublic void onResult(List<LocalMedia> result) {// onResult Callbackfor (LocalMedia localMedia : result){Log.i("MainActivity",localMedia.getPath());}System.out.println(result.toString());Glide.with(MainActivity.this).load(Uri.fromFile(new File(result.get(0).getRealPath()))).into(imageView);}@Overridepublic void onCancel() {// onCancel Callback}});}});
我们点击相册中的图片通过回调函数可以拿到图片的本地路径/storage/emulated/0/DCIM
