Question

在我的应用程序上我实现了一个启动活动，检查是否是第一次运行应用程序，如果为true则显示对话框消息，这是代码：

 public void onConnected(Bundle connectionHint) {
    if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
        myLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
    }
    SharedPreferences getPrefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());

    boolean isFirstStart = getPrefs.getBoolean("firstStart", true);
    if (isFirstStart) {
        android.app.AlertDialog alertDialog = new android.app.AlertDialog.Builder(splashscreen.this).create();
        alertDialog.setTitle(getResources().getString(R.string.titolo_intro_sms));
        alertDialog.setMessage(getResources().getString(R.string.intro_sms));
        alertDialog.setButton(android.app.AlertDialog.BUTTON_NEUTRAL, "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {

                        Intent i = new Intent(splashscreen.this, MainActivity.class);
                        startActivity(i);

                    }
                });
        alertDialog.show();

        SharedPreferences.Editor e = getPrefs.edit();
        e.putBoolean("firstStart", false);
        e.apply();
    } else {

        startApp();
    }
}

如果单击确定显示对话框，则打开MainActivity。现在＆＃39; Ok＆＃39;点击进入对话框以启动MainActivity我想显示一个对话请求权限。我为此创建了一个抽象类，我用这种方式调用：

requestAppPermissions(new String[]{
                                        Manifest.permission.ACCESS_COARSE_LOCATION},
                                R.string.msg,REQUEST_PERMISSION);

现在我将此行代码设置为OnCreate，在启动活动之前显示权限请求但是如果我设置为onClick方法＆＃39; ok＆＃39;转发对话不显示。

点击“确定”以启动主要活动后如何显示权限请求？任何帮助都很棒感谢

我已经以这种方式将我的onRequestPermissionresult集成到抽象类中：

 @Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    int permissionCheck = PackageManager.PERMISSION_GRANTED;
    for(int permisson : grantResults) {
        permissionCheck = permissionCheck + permisson;
    }

    if( (grantResults.length > 0) && PackageManager.PERMISSION_GRANTED == permissionCheck) {
        onPermissionsGranted(requestCode);
        Intent i = new Intent(this, MainActivity.class); //start activity
        startActivity(i);
    } else {
        //Display message when contain some Dangerous permisson not accept
        Snackbar.make(findViewById(android.R.id.content), mErrorString.get(requestCode),
                Snackbar.LENGTH_INDEFINITE).setAction("ENABLE", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent();
                i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                i.setData(Uri.parse("package:" + getPackageName()));
                i.addCategory(Intent.CATEGORY_DEFAULT);
                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
                startActivity(i);
            }
        }).show();
    }
}

并且在点击确认后显示消息权限但在应用关闭后并且未打开MainActivity

我已经更改了我的splashcrenn并且已经将所有关于permsion的方法设置到其中，这是代码：

public void onPermissionsGranted(int requestCode) {

}

public void requestAppPermissions(final String[]requestedPermissions, final int stringId, final int requestCode) {
    mErrorString.put(requestCode, stringId);

    int permissionCheck = PackageManager.PERMISSION_GRANTED;
    boolean showRequestPermissions = false;
    for(String permission: requestedPermissions) {
        permissionCheck = permissionCheck + ContextCompat.checkSelfPermission(this, permission);
        showRequestPermissions = showRequestPermissions || ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
    }

    if (permissionCheck!=PackageManager.PERMISSION_GRANTED) {
        if(showRequestPermissions) {
            Snackbar.make(findViewById(android.R.id.content), stringId, Snackbar.LENGTH_INDEFINITE).setAction("GRANT", new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    ActivityCompat.requestPermissions(splashscreen.this, requestedPermissions, requestCode);
                }
            }).show();
        } else {

            ActivityCompat.requestPermissions(this, requestedPermissions, requestCode);
        }
    } else {
        onPermissionsGranted(requestCode);
    }
}

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

        case 1: {

            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getApplicationContext(), "Permission granted", Toast.LENGTH_SHORT).show();
                Intent i = new Intent(splashscreen.this, MainActivity.class); //start activity
                splashscreen.this.startActivity(i);
            } else {
                Toast.makeText(getApplicationContext(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
            return;
        }

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

进入对话框＆＃39; ok＆＃39;点击按钮我设置了这个：

alertDialog.setButton(android.app.AlertDialog.BUTTON_NEUTRAL, "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions(splashscreen.this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);

                        /*Intent i = new Intent(splashscreen.this, MainActivity.class);
                        startActivity(i);*/

                    }
                });
        alertDialog.show();

但是当我点击确定应用关闭而不打开MainActivity

Answer 1

试试这个：

按钮点击显示权限对话框：

alertDialog.setButton(android.app.AlertDialog.BUTTON_NEUTRAL, "OK",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1); //show reuest dialog

                }
            });
    alertDialog.show();

现在抓住onRequestPermissionsResult()中的结果并开始MainActivity

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

        case 1: {

            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getContext(), "Permission granted", Toast.LENGTH_SHORT).show();
                Intent i = new Intent(splashscreen.this, MainActivity.class); //start activity
                startActivity(i);
            } else {
                Toast.makeText(getContext(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
            return;
        }

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

您的抽象类中的

传递您的活动上下文并使用它来启动MainActivity

传递上下文：

    class YourAbstractClass{

// variable to hold context
private Context context;

//save the context recievied via constructor in a local variable

public YourAbstractClass(Context context){  //constructor
    this.context=context;
  }
}

在你的splash Activity中调用你的Abstract类，如：

YourAbstractClass class = new YourAbstractClass(this); //pass context

现在使用上下文startActivity

Intent myIntent = new Intent(context, MainActivity.class);
context.startActivity(myIntent);

Answer 2

单击“确定”后请求权限，但不要立即启动活动。等待onRequestPermissionResult中的结果，然后在那里开始MainActivity。

Answer 3

在按钮调用中使用if-else语句。

如果您已拥有权限，则执行MainActivity调用如果是部分。如果没有，那么在if-else的其他部分请求许可。

现在使用 OnRequestPermissionResult 方法，在授予或拒绝权限时调用该方法。如果在此方法中授予了权限，则再次执行MainActivity调用，或者只是在拒绝权限时执行您需要执行的操作，例如向他显示您需要权限的原因并重试或退出。

希望它有所帮助。有关Android中的权限的简要版本，请单击HERE (http://www.vogella.com/tutorials/AndroidPermissions/article.html)。

主要活动前的Android检查权限

3 个答案: