Android调用相机拍照和本地上传图片添加到ImageView 适配6.0,7.0,8.0,9.0

## 引言:首先工作中可以学到新的东西,在项目开发中会常常遇到一些问题.多番查找资料一直9.0版本拍照和相册一直无法显示,并且把ImageView默认的占位图都消失.问题已经解决.

1,首先版本6.0以上必须动态授权,9.0手机好像可以自动检测并弹出对话框询问.
2,直接看代码吧:
加入app中build.gradle //动态权限申请库
implementation ‘pub.devrel:easypermissions:1.3.0’

public class AddProposalActivity extends AppCompatActivity implements View.OnClickListener {


    private ImageView mAddBack;
    public static final int TAKE_PHOTO = 1;
    public static final int CHOOSE_PHOTO = 2;
    private Uri imageUri;
    private String[] permissions = {Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE};
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_proposal);

        initView();
        initData();
    }

    public void initData() {
    }

    public void initView() {
        mAddHead = findViewById(R.id.add_head);
        mAddHead.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.add_head:
                showPopueWindow();
                break;
        }
    }
    //获取权限
    private void getPermission() {
        if (EasyPermissions.hasPermissions(this, permissions)) {
            //已经打开权限
            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
            intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
            startActivityForResult(intent, TAKE_PHOTO);
            Toast.makeText(this, "已经申请相关权限", Toast.LENGTH_SHORT).show();
        } else {
            //没有打开相关权限、申请权限
            EasyPermissions.requestPermissions(this, "需要获取您的相册、照相使用权限", 1, permissions);
        }

    }
    private void showPopueWindow(){
        View popView = View.inflate(this,R.layout.popupwindow_camera_need,null);
        Button bt_album = (Button) popView.findViewById(R.id.btn_pop_album);
        Button bt_camera = (Button) popView.findViewById(R.id.btn_pop_camera);
        Button bt_cancle = (Button) popView.findViewById(R.id.btn_pop_cancel);
        //获取屏幕宽高
        int weight = getResources().getDisplayMetrics().widthPixels;
        int height = getResources().getDisplayMetrics().heightPixels*1/3;

        final PopupWindow popupWindow = new PopupWindow(popView,weight,height);
        popupWindow.setFocusable(true);
        //点击外部popueWindow消失
        popupWindow.setOutsideTouchable(true);
        //本地相册
        bt_album.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ContextCompat.checkSelfPermission(AddProposalActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(AddProposalActivity.this, new String[]{ Manifest.permission. WRITE_EXTERNAL_STORAGE }, 1);
                } else {
                    openAlbum();
                }

                popupWindow.dismiss();
            }
        });
        //相机拍照
        bt_camera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 创建File对象，用于存储拍照后的图片
                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) {
                    imageUri = Uri.fromFile(outputImage);
                } else {
                    imageUri = FileProvider.getUriForFile(AddProposalActivity.this, "com.example.haiyue.myapplication.fileprovider", outputImage);
                }
                // 启动相机程序
                getPermission();


            }
        });

        //取消
        bt_cancle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                popupWindow.dismiss();
            }
        });
        //popupWindow消失屏幕变为不透明
        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                WindowManager.LayoutParams lp = getWindow().getAttributes();
                lp.alpha = 1.0f;
                getWindow().setAttributes(lp);
            }
        });
        //popupWindow出现屏幕变为半透明
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.alpha = 0.5f;
        getWindow().setAttributes(lp);
        popupWindow.showAtLocation(popView, Gravity.BOTTOM,0,0);

    }


    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    openAlbum();
                } else {
                    //框架要求必须这么写
                    EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
                    Toast.makeText(this, "You denied the permission", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case TAKE_PHOTO:
                if (resultCode == RESULT_OK) {
                    try {
                        // 将拍摄的照片显示出来
                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                        mAddHead.setImageBitmap(bitmap);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                break;
            case CHOOSE_PHOTO:
                if (resultCode == RESULT_OK) {
                    // 判断手机系统版本号
                    if (Build.VERSION.SDK_INT >= 19) {
                        // 4.4及以上系统使用这个方法处理图片
                        handleImageOnKitKat(data);
                    } else {
                        // 4.4以下系统使用这个方法处理图片
                        handleImageBeforeKitKat(data);
                    }
                }
                break;
            default:
                break;
        }
    }
    @TargetApi(19)
    private void handleImageOnKitKat(Intent data) {
        String imagePath = null;
        Uri uri = data.getData();
        Log.d("TAG", "handleImageOnKitKat: uri is " + uri);
        if (DocumentsContract.isDocumentUri(this, uri)) {
            // 如果是document类型的Uri，则通过document id处理
            String docId = DocumentsContract.getDocumentId(uri);
            if("com.android.providers.media.documents".equals(uri.getAuthority())) {
                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 ("com.android.providers.downloads.documents".equals(uri.getAuthority())) {
                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，直接获取图片路径即可
            imagePath = uri.getPath();
        }
        displayImage(imagePath); // 根据图片路径显示图片
    }

    private void handleImageBeforeKitKat(Intent data) {
        Uri uri = data.getData();
        String imagePath = getImagePath(uri, null);
        displayImage(imagePath);
    }

    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;
    }

    private void displayImage(String imagePath) {
        if (imagePath != null) {
            Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
            mAddHead.setImageBitmap(bitmap);
        } else {
            Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();
        }
    }
    private void openAlbum() {
        Intent intent = new Intent("android.intent.action.GET_CONTENT");
        intent.setType("image/*");
        startActivityForResult(intent, CHOOSE_PHOTO); // 打开相册
    }
}

3,在清单文件中:

然后创建xml文件夹:file_paths

本地相册效果图:由于屏幕太大截图图片过大,截取一半

点击相机效果图:本手机魅族16x 需要手动授权

最后在清单文件 配置相机和读写权限…否则无效.