PlayerAndroid/app/src/main/java/code/name/monkey/retromusic/ui/activities/base/AbsBaseActivity.java

package code.name.monkey.retromusic.ui.activities.base;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.view.KeyEvent;
import android.view.View;
import code.name.monkey.appthemehelper.ThemeStore;
import code.name.monkey.retromusic.R;
import uk.co.chrisjenx.calligraphy.CalligraphyContextWrapper;


public abstract class AbsBaseActivity extends AbsThemeActivity {

  public static final int PERMISSION_REQUEST = 100;
  private boolean hadPermissions;
  private String[] permissions;
  private String permissionDeniedMessage;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setVolumeControlStream(AudioManager.STREAM_MUSIC);

    permissions = getPermissionsToRequest();
    hadPermissions = hasPermissions();

    setPermissionDeniedMessage(null);
  }

  @Override
  protected void onPostCreate(@Nullable Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    if (!hasPermissions()) {
      requestPermissions();
    }
  }

  @Override
  protected void onResume() {
    super.onResume();
    final boolean hasPermissions = hasPermissions();
    if (hasPermissions != hadPermissions) {
      hadPermissions = hasPermissions;
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        onHasPermissionsChanged(hasPermissions);
      }
    }

  }

  protected void onHasPermissionsChanged(boolean hasPermissions) {
    // implemented by sub classes
  }

  @Override
  public boolean dispatchKeyEvent(@NonNull KeyEvent event) {
    if (event.getKeyCode() == KeyEvent.KEYCODE_MENU && event.getAction() == KeyEvent.ACTION_UP) {
      showOverflowMenu();
      return true;
    }
    return super.dispatchKeyEvent(event);
  }

  protected void showOverflowMenu() {

  }

  @Override
  protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
  }

  @Nullable
  protected String[] getPermissionsToRequest() {
    return null;
  }

  protected View getSnackBarContainer() {
    return getWindow().getDecorView();
  }

  private String getPermissionDeniedMessage() {
    return permissionDeniedMessage == null ? getString(R.string.permissions_denied)
        : permissionDeniedMessage;
  }

  protected void setPermissionDeniedMessage(String message) {
    permissionDeniedMessage = message;
  }

  protected void requestPermissions() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && permissions != null) {
      requestPermissions(permissions, PERMISSION_REQUEST);
    }
  }

  protected boolean hasPermissions() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && permissions != null) {
      for (String permission : permissions) {
        if (checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
          return false;
        }
      }
    }
    return true;
  }

  @Override
  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
      @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == PERMISSION_REQUEST) {
      for (int grantResult : grantResults) {
        if (grantResult != PackageManager.PERMISSION_GRANTED) {
          if (ActivityCompat.shouldShowRequestPermissionRationale(AbsBaseActivity.this,
              Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            //User has deny from permission dialog
            Snackbar.make(getSnackBarContainer(), getPermissionDeniedMessage(),
                Snackbar.LENGTH_INDEFINITE)
                .setAction(R.string.action_grant, view -> requestPermissions())
                .setActionTextColor(ThemeStore.accentColor(this))
                .show();
          } else {
            // User has deny permission and checked never show permission dialog so you can redirect to Application settings page
            Snackbar.make(getSnackBarContainer(), getPermissionDeniedMessage(),
                Snackbar.LENGTH_INDEFINITE)
                .setAction(R.string.action_settings, view -> {
                  Intent intent = new Intent();
                  intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                  Uri uri = Uri.fromParts("package", AbsBaseActivity.this.getPackageName(), null);
                  intent.setData(uri);
                  startActivity(intent);
                })
                .setActionTextColor(ThemeStore.accentColor(this))
                .show();
          }
          return;
        }
      }
      hadPermissions = true;
      onHasPermissionsChanged(true);
    }
  }
}