StartActivity 一旦用户在权限屏幕上单击允许

Question

我的 activity 需要位置许可，我写了下面的代码来获得许可。但在这种情况下，如果应用最初没有位置权限，用户需要点击两次才能打开 activity。我可以做一些更改，以便一旦用户在“权限”屏幕上单击“允许”，然后才会触发 intent。

 int PERMISSION_ALL = 1;
                            String[] PERMISSIONS = new String[0];
                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                                PERMISSIONS = new String[]{
                                        Manifest.permission.ACCESS_FINE_LOCATION};
                            }

                            if (!hasPermissions(getApplicationContext(), PERMISSIONS)) {
                                ActivityCompat.requestPermissions(StartupActivity.this, PERMISSIONS, PERMISSION_ALL);
                            }

                            if (hasPermissions(getApplicationContext(), PERMISSIONS)) {
                                new Thread(new Runnable() {
                                    @Override
                                    public void run() {
                                        Intent intent = new Intent(StartActivity.this, Details.class);
                                        startActivity(intent);
                                    }
                                }).start();
                            }

Answer 1

override onRequestPermissionsResult 如果获得许可，则从那里开始 Activity

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if(requestCode == PERMISSION_ALL){
        if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED ){

             new Thread(new Runnable() {
                    @Override
                    public void run() {
                        Intent intent = new Intent(StartActivity.this, Details.class);
                        startActivity(intent);
                    }
                }).start();
        }else{
            Toast.makeText(MainActivity.this, "Access Denied ! Cannot proceed further ", Toast.LENGTH_SHORT).show();
        }
    }
}

注意：显然，代码似乎在 StartupActivity 中（来自 StartupActivity.this），因此您不需要创建线程，只需启动您的 Details Activity 简单 Intent

代码将是

class StartupActivity extends ..{

    onCreate...(){}

    // here you will have onRequestPermissionsResult 
    @Override
    public void onRequestPermissionsResult( ....){...}

}

Answer 2

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

// Handle your permission grant/reject scenarios here, 
for( int x = 0; x < grantResults.length; x++ )
{
    if( grantResults[x] == PackageManager.PERMISSION_GRANTED )
    {
         // Since you had one, start your new activity here
    }
    else
    {
        // Do something with the permissions that got BLOCKED??
    }
}

}

这将由 android 内部调用，一旦用户 grants/rejects 获得许可

Answer 3

是的，您需要覆盖 onRequestPermissionsResult

首先在 onCreate

int PERMISSION_ALL = 1;
String[] PERMISSIONS = new String[0];
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    PERMISSIONS = new String[]{
            Manifest.permission.ACCESS_FINE_LOCATION};
}

if (!hasPermissions(getApplicationContext(), PERMISSIONS)) {
    ActivityCompat.requestPermissions(StartupActivity.this, PERMISSIONS, PERMISSION_ALL);
}

然后覆盖

  @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == PERMISSION_ALL) {
                Intent intent = new Intent(StartActivity.this,Details.class);
                startActivity(intent);
        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

Answer 4

当您的应用请求权限时，系统会向用户显示一个对话框。当用户响应时，系统会调用您应用的 onRequestPermissionsResult() 方法，将用户响应传递给它。您的应用程序必须重写该方法才能确定是否授予了权限。回调传递给您传递给 requestPermissions() 的相同请求代码。例如，如果应用程序请求 READ_CONTACTS 访问，它可能具有以下回调方法：

@Override
    public void onRequestPermissionsResult(int requestCode,
            String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.

                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }
                return;
            }

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

StartActivity 一旦用户在权限屏幕上单击允许

StartActivity once user click Allow on Permission Screen

java

android

android-permissions