Android---图片相册选择和相机拍照

Android---图片相册选择和相机拍照 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d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

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app
            Toast.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 {

    
    @Override
    public void loadImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {
        Glide.with(context)
                .load(url)
                .into(imageView);
    }

    
    @Override
    public void loadImage(@NonNull Context context, @NonNull String url,
                          @NonNull ImageView imageView,
                          SubsamplingScaleImageView longImageView, OnImageCompleteCallback callback) {
        Glide.with(context)
                .asBitmap()
                .load(url)
                .into(new ImageViewTarget(imageView) {
                    @Override
                    public void onLoadStarted(@Nullable Drawable placeholder) {
                        super.onLoadStarted(placeholder);
                        if (callback != null) {
                            callback.onShowLoading();
                        }
                    }

                    @Override
                    public void onLoadFailed(@Nullable Drawable errorDrawable) {
                        super.onLoadFailed(errorDrawable);
                        if (callback != null) {
                            callback.onHideLoading();
                        }
                    }

                    @Override
                    protected 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);
                            }
                        }
                    }
                });
    }

    
    @Override
    public void loadImage(@NonNull Context context, @NonNull String url,
                          @NonNull ImageView imageView,
                          SubsamplingScaleImageView longImageView) {
        Glide.with(context)
                .asBitmap()
                .load(url)
                .into(new ImageViewTarget(imageView) {
                    @Override
                    protected 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);
                            }
                        }
                    }
                });
    }

    
    @Override
    public 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) {
                    @Override
                    protected void setResource(Bitmap resource) {
                        RoundedBitmapDrawable circularBitmapDrawable =
                                RoundedBitmapDrawableFactory.
                                        create(context.getResources(), resource);
                        circularBitmapDrawable.setCornerRadius(8);
                        imageView.setImageDrawable(circularBitmapDrawable);
                    }
                });
    }


    
    @Override
    public void loadAsGifImage(@NonNull Context context, @NonNull String url,
                               @NonNull ImageView imageView) {
        Glide.with(context)
                .asGif()
                .load(url)
                .into(imageView);
    }

    
    @Override
    public 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() {
            @Override
            public void onClick(View v) {
                PictureSelector.create(MainActivity.this)
                        .openGallery(PictureMimeType.ofAll())
                        .imageEngine(GlideEngine.createGlideEngine())
                        .forResult(new OnResultCallbackListener() {
                            @Override
                            public void onResult(List result) {
                                // onResult Callback
                                for (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);

                            }

                            @Override
                            public 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