android 8.0 调用相机打开相册

添加依赖

//动态权限    implementation 'pub.devrel:easypermissions:2.0.1'

添加权限

在清单文件中注册内容提供器， android:authorities 属性的值要和FileProvider.getUriForFile(MainActivity.this,VERA_FILEPROVIDER,outputImage)中第二个参数的值一样

创建@xml/file_paths

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

申请权限的代码：

        String[] perms={                Manifest.permission.CAMERA,Manifest.permission.INTERNET,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE        };        if (EasyPermissions.hasPermissions(this,perms)){            init();        }else{            EasyPermissions.requestPermissions(this,getString(R.string.permission),RC_CEMERA_AND_LOCATION,perms);        }

调用相机拍照并保存到相册

    private void takePhoto() {//        创建file对象，用于存储拍照后的对象        File outputImage=new File(getExternalCacheDir(),"output_image.jpg");        try{            if (outputImage.exists())outputImage.delete();            outputImage.createNewFile();        } catch (IOException e) {            e.printStackTrace();        }        if (Build.VERSION.SDK_INT>=24){//            FileProvider是一种特殊的内容提供器，使用了和内容提供器类似的机制来保护数据，可以选择性的将封装过的Uri共享给外部，从而提高应用的安全性。            mImageUri= FileProvider.getUriForFile(MainActivity.this,VERA_FILEPROVIDER,outputImage);        }else{            mImageUri=Uri.fromFile(outputImage);        }//        启动相机程序        Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//        指定调用相机拍照后的照片存储的地址        intent.putExtra(MediaStore.EXTRA_OUTPUT,mImageUri);        startActivityForResult(intent,TAKE_PHOTO_RC);    }

打开相册显示选中的图片

    private void choosePhoto() {        Intent intent=new Intent("android.intent.action.GET_CONTENT");        intent.setType("image/*");        startActivityForResult(intent,CHOOSE_PHOTO);    }

在onActivityResult（）中处理：

    @Override    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        switch (requestCode){            case TAKE_PHOTO_RC:                if (resultCode==RESULT_OK){                    try {                        Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(mImageUri));                        mImage.setImageBitmap(bitmap);//                        保存到相册                        ImgUtil.saveImageToGallery(this,bitmap);                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    }                }                break;            case CHOOSE_PHOTO:                if (resultCode==RESULT_OK){                    if (Build.VERSION.SDK_INT>=19){                        handleImageOn19(data);                    }else{                        handleImageBefore10(data);                    }                }        }    }    private void handleImageBefore10(Intent intent) {        Uri uri=intent.getData();        String imagePath=getImagePath(uri,null);        displayImage(imagePath);    }    @TargetApi(19)    private void handleImageOn19(Intent intent) {        String imagePath=null;        Uri uri=intent.getData();        if (DocumentsContract.isDocumentUri(this,uri)){//            如果是document类型的uri，通过document id处理            String docId=DocumentsContract.getDocumentId(uri);            if (uri.getAuthority().equals("com.android.providers.media.documents")){                String id=docId.split(":")[1];//解析出数字格式的id                String selection=MediaStore.Images.Media._ID+"="+id;                imagePath=getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);            }else if (uri.getAuthority().equals("com.android.providers.downloads.documents")){                Uri contentUri= ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(docId));                imagePath=getImagePath(contentUri,null);            }        }else if ("content".equalsIgnoreCase(uri.getScheme())){//            如果是content类型的uri，则使用普通方式处理            imagePath=getImagePath(uri,null);        }else if ("file".equalsIgnoreCase(uri.getScheme())){//            如果是file类型的uri，直接获取图片路径            imagePath=uri.getPath();        }        displayImage(imagePath);    }    private void displayImage(String imagePath) {        if (imagePath!=null){            Bitmap bitmap=BitmapFactory.decodeFile(imagePath);            mImage.setImageBitmap(bitmap);        }else{            Toast.makeText(this, "failed", Toast.LENGTH_SHORT).show();        }    }    private String getImagePath(Uri uri, String selection) {        String path=null;//        通过Uri和selection来获取真实的图片路径        Cursor cursor=getContentResolver().query(uri,null,selection,null,null);        if (cursor!=null){            if (cursor.moveToFirst()){                path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));            }            cursor.close();        }        return path;    }

保存图片到相册

public class ImgUtil {    public static void saveImageToGallery(Context context, Bitmap bitmap){//        首先保存图片        File appDir = new File(Environment.getExternalStorageDirectory(), "vgmap");        if (!appDir.exists()){            appDir.mkdirs();        }        String filename=System.currentTimeMillis()+".jpg";        File file=new File(appDir,filename);        try {            FileOutputStream fileOutputStream=new FileOutputStream(file);            bitmap.compress(Bitmap.CompressFormat.JPEG,100,fileOutputStream);            fileOutputStream.flush();            fileOutputStream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }//        其次把文件插入到系统图库        try {            MediaStore.Images.Media.insertImage(context.getContentResolver(),file.getAbsolutePath(),filename,null);        } catch (FileNotFoundException e) {            e.printStackTrace();        }//        最后通知图库更新        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath())));    }}

整个MainActivity的代码：

package com.example.anew;import android.Manifest;import android.annotation.TargetApi;import android.content.ContentUris;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.provider.DocumentsContract;import android.provider.MediaStore;import android.support.annotation.Nullable;import android.support.v4.content.FileProvider;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import com.example.anew.utils.ImgUtil;import pub.devrel.easypermissions.EasyPermissions;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private static final int TAKE_PHOTO_RC = 2;    private static final int CHOOSE_PHOTO = 3;    private Button mBtnTakephoto;    private ImageView mImage;    private Button mBtnChoosePhoto;    private static final int RC_CEMERA_AND_LOCATION = 1;    private static final String VERA_FILEPROVIDER = "VERA_FILEPROVIDER";//    照片所在的uri地址    private Uri mImageUri;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mBtnTakephoto = (Button) findViewById(R.id.btn_takephoto);        mImage = (ImageView) findViewById(R.id.image);        mBtnChoosePhoto = (Button) findViewById(R.id.btn_choose_photo);        mBtnTakephoto.setOnClickListener(this);        mBtnChoosePhoto.setOnClickListener(this);        String[] perms={                Manifest.permission.CAMERA,Manifest.permission.INTERNET,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE        };        if (EasyPermissions.hasPermissions(this,perms)){            init();        }else{            EasyPermissions.requestPermissions(this,getString(R.string.permission),RC_CEMERA_AND_LOCATION,perms);        }    }    private void init() {    }    @Override    public void onClick(View v) {        switch (v.getId()){            case R.id.btn_takephoto:                takePhoto();                break;            case R.id.btn_choose_photo:                choosePhoto();                break;        }    }    private void choosePhoto() {        Intent intent=new Intent("android.intent.action.GET_CONTENT");        intent.setType("image/*");        startActivityForResult(intent,CHOOSE_PHOTO);    }    private void takePhoto() {//        创建file对象，用于存储拍照后的对象        File outputImage=new File(getExternalCacheDir(),"output_image.jpg");        try{            if (outputImage.exists())outputImage.delete();            outputImage.createNewFile();        } catch (IOException e) {            e.printStackTrace();        }        if (Build.VERSION.SDK_INT>=24){//            FileProvider是一种特殊的内容提供器，使用了和内容提供器类似的机制来保护数据，可以选择性的将封装过的Uri共享给外部，从而提高应用的安全性。            mImageUri= FileProvider.getUriForFile(MainActivity.this,VERA_FILEPROVIDER,outputImage);        }else{            mImageUri=Uri.fromFile(outputImage);        }//        启动相机程序        Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//        指定调用相机拍照后的照片存储的地址        intent.putExtra(MediaStore.EXTRA_OUTPUT,mImageUri);        startActivityForResult(intent,TAKE_PHOTO_RC);    }    @Override    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        switch (requestCode){            case TAKE_PHOTO_RC:                if (resultCode==RESULT_OK){                    try {                        Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(mImageUri));                        mImage.setImageBitmap(bitmap);//                        保存到相册                        ImgUtil.saveImageToGallery(this,bitmap);                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    }                }                break;            case CHOOSE_PHOTO:                if (resultCode==RESULT_OK){                    if (Build.VERSION.SDK_INT>=19){                        handleImageOn19(data);                    }else{                        handleImageBefore10(data);                    }                }        }    }    private void handleImageBefore10(Intent intent) {        Uri uri=intent.getData();        String imagePath=getImagePath(uri,null);        displayImage(imagePath);    }    @TargetApi(19)    private void handleImageOn19(Intent intent) {        String imagePath=null;        Uri uri=intent.getData();        if (DocumentsContract.isDocumentUri(this,uri)){//            如果是document类型的uri，通过document id处理            String docId=DocumentsContract.getDocumentId(uri);            if (uri.getAuthority().equals("com.android.providers.media.documents")){                String id=docId.split(":")[1];//解析出数字格式的id                String selection=MediaStore.Images.Media._ID+"="+id;                imagePath=getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);            }else if (uri.getAuthority().equals("com.android.providers.downloads.documents")){                Uri contentUri= ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"),Long.valueOf(docId));                imagePath=getImagePath(contentUri,null);            }        }else if ("content".equalsIgnoreCase(uri.getScheme())){//            如果是content类型的uri，则使用普通方式处理            imagePath=getImagePath(uri,null);        }else if ("file".equalsIgnoreCase(uri.getScheme())){//            如果是file类型的uri，直接获取图片路径            imagePath=uri.getPath();        }        displayImage(imagePath);    }    private void displayImage(String imagePath) {        if (imagePath!=null){            Bitmap bitmap=BitmapFactory.decodeFile(imagePath);            mImage.setImageBitmap(bitmap);        }else{            Toast.makeText(this, "failed", Toast.LENGTH_SHORT).show();        }    }    private String getImagePath(Uri uri, String selection) {        String path=null;//        通过Uri和selection来获取真实的图片路径        Cursor cursor=getContentResolver().query(uri,null,selection,null,null);        if (cursor!=null){            if (cursor.moveToFirst()){                path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));            }            cursor.close();        }        return path;    }}

整个MainActivity的代码：

更多相关文章

随机推荐

android 8.0 调用相机 打开相册

整个MainActivity的代码：

更多相关文章

随机推荐

android 8.0 调用相机打开相册