Android多权限错误

Question

情况:当相机(图像视图)被点击时，它将提示多个权限。

1. 如果用户选择拒绝在第一和第二权限，它是有效的。
2. 如果用户选择允许在第一和第二权限，它的工作。
3. 如果用户选择拒绝在第一权限和允许在第二权限，它是有效的。
4. 如果用户在第一个权限上选择“允许”，而在第二个权限上选择“拒绝”，则会出现错误。

下面是代码(扩展片段)：

private static String[] PERMISSIONS_CAMERA = {Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};


 img_1 = (ImageView) view.findViewById(R.id.img_1);
 img_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startCamera();
            }
        });    
        private void StartCamera() {
        requestPermissions(PERMISSIONS_CAMERA, REQUEST_CAMERA);
    }

   private void OpenCamera() {
        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, REQUEST_CAMERA);
        this.bitmap = null;
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

     switch (requestCode) {
            // For camera
            case REQUEST_CAMERA:
                 if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    OpenCamera();
                } else {
                    Toast.makeText(getActivity(), "Go to settings and enable permissions", Toast.LENGTH_LONG).show();
                }
                break;
    }

}

错误日志：

  java.lang.RuntimeException: Failure delivering result
  ResultInfo{who=@android:requestPermissions:, request=131073,
  result=-1, data=Intent {
  act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to
  activity {app.swb.mont/app.swb.mont.ui.activity.MainActivity}:
  java.lang.SecurityException: Permission Denial: starting Intent {
  act=android.media.action.IMAGE_CAPTURE
  cmp=com.sec.android.app.camera/.Camera } from ProcessRecord{b2f7ceb
  28260:app.swb.mont/u0a392} (pid=28260, uid=10392) with revoked
  permission android.permission.CAMERA at    android.app.ActivityThread.deliverResults(ActivityThread.java:4925)
                   at android.app.ActivityThread.handleSendResult(ActivityThread.java:4968)
                   at android.app.ActivityThread.access$1600(ActivityThread.java:222)
                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1849)
                   at android.os.Handler.dispatchMessage(Handler.java:102)
                   at android.os.Looper.loop(Looper.java:158)
                   at android.app.ActivityThread.main(ActivityThread.java:7229)
                   at java.lang.reflect.Method.invoke(Native Method)
                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
                Caused by: java.lang.SecurityException: Permission Denial: starting Intent { act=android.media.action.IMAGE_CAPTURE
 cmp=com.sec.android.app.camera/.Camera } from ProcessRecord{b2f7ceb
 28260:app.swb.mont/u0a392} (pid=28260, uid=10392) with revoked
 permission android.permission.CAMERA

Answer 1

问题是您没有正确地处理onRequestPermissionResult。这条线上

if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                OpenCamera();}

您只检查您所请求的女巫在本例中是Manifest.permission.READ_EXTERNAL_STORAGE (位置== 0)的第一个权限，并且触发您的相机功能，它需要在位置== 2处获得许可。

解决方案

if (grantResults.length > 0 && grantResults[2] == PackageManager.PERMISSION_GRANTED) {
                OpenCamera();}

或

if (grantResults.length > 0 && (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED) ) {
                OpenCamera();}

//还可以使用循环

Answer 2

这是因为您只检查第一权限结果，而不检查第二：grantResults[0] == PackageManager.PERMISSION_GRANTED。您还需要检查grantResults[1] == PackageManager.PERMISSION_GRANTED

Answer 3

如果您的要求是，如果所有的权限给定，那么只有它必须工作，您可以这样做

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[]permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            // For camera
            case REQUEST_CAMERA:
                if (grantResults.length > 0) {
                    boolean permGiven = true;
                    for(int i=0; i<grantResults.length; i++){
                        if(grantResults[i] != PackageManager.PERMISSION_GRANTED)
                            permGiven = false;
                    }
                    if(permGiven)
                        OpenCamera();
                    else
                        Toast.makeText(MainActivity.this, "Go to settings and enable permissions", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(MainActivity.this, "Go to settings and enable permissions", Toast.LENGTH_LONG).show();
                }
                break;


        }
    }