java - 请求权限对话框未显示

Question

我正在尝试在 Android 应用程序上请求 READ_EXTERNAL_STORAGE 的权限。我的问题是没有显示对话框，因此也永远不会调用“onRequestPermissionsResult”。我在这里做错了什么吗？我点击了这个链接:Developer Android

这是我的代码:

public class AccountActivity extends AppCompatActivity {

    protected TextView changeProfileImgBtn;
    private static final int SELECTED_PICTURE = 1;
    private static final int F = 101;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_account);

        changeProfileImgBtn = (TextView) findViewById(R.id.accountChangeProfileImgBtn);

        changeProfileImgBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (ContextCompat.checkSelfPermission(AccountActivity.this,
                        Manifest.permission.READ_EXTERNAL_STORAGE)
                        != PackageManager.PERMISSION_GRANTED) {

                    if (ActivityCompat.shouldShowRequestPermissionRationale(AccountActivity.this,
                                Manifest.permission.READ_EXTERNAL_STORAGE)) {
                         System.out.println("shouldShowRequestPermissionRationale");

                    } else {
                        ActivityCompat.requestPermissions(AccountActivity.this,
                                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                                F);

                        System.out.println("REQUEST");

                    }
                } else {
                    Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                    startActivityForResult(i, SELECTED_PICTURE);
                }
            }
        });
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String permissions[], @NonNull int[] grantResults) {

        System.out.println("onRequestPermissionsResult");
        switch (requestCode) {
            case F: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    System.out.println("GRANTED");

                    Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                    startActivityForResult(i, SELECTED_PICTURE);

                } else {
                    System.out.println("DENIED");
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }
}

正如您在日志中看到的那样，ActivityCompat.requestPermissions(...) 在打印“REQUEST”时被调用。无论我运行的设备如何，“shouldShowRequestPermissionRationale”都不会被打印。 “onRequestPermissionsResult”都不会被打印。

D/ViewRootImpl: ViewPostImeInputStage processPointer 0
D/ViewRootImpl: ViewPostImeInputStage processPointer 1
I/System.out: REQUEST
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@ee9f27b time:106175669

我已将其包含在我的 list 文件中:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

非常感谢任何帮助。

Answer 1

更新:您的 list 中是否请求了权限？您只能请求 list 中的权限。

此处的文档:https://developer.android.com/guide/topics/manifest/manifest-intro.html