SettingsActivity.java

package de.robv.android.xposed.installer;

import android.Manifest;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.ActionBar;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Toast;

import com.afollestad.materialdialogs.folderselector.FolderChooserDialog;

import java.io.File;
import java.io.IOException;

import de.robv.android.xposed.installer.util.RepoLoader;
import de.robv.android.xposed.installer.util.ThemeUtil;

public class SettingsActivity extends XposedBaseActivity implements FolderChooserDialog.FolderCallback {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ThemeUtil.setTheme(this);
        setContentView(R.layout.activity_container);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });

        ActionBar ab = getSupportActionBar();
        if (ab != null) {
            ab.setTitle(R.string.nav_item_settings);
            ab.setDisplayHomeAsUpEnabled(true);
        }

        setFloating(toolbar, 0);

        if (savedInstanceState == null) {
            getFragmentManager().beginTransaction()
                    .add(R.id.container, new SettingsFragment()).commit();
        }

    }

    @Override
    public void onFolderSelection(@NonNull FolderChooserDialog dialog, @NonNull File folder) {
        if (folder.canWrite()) {
            XposedApp.getPreferences().edit().putString("download_location", folder.getPath()).apply();
        } else {
            Toast.makeText(this, R.string.sdcard_not_writable, Toast.LENGTH_SHORT).show();
        }
    }

    public static class SettingsFragment extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener, Preference.OnPreferenceClickListener {
        private static final File mDisableResourcesFlag = new File(XposedApp.BASE_DIR + "conf/disable_resources");
        private Preference mClickedPreference;
        private Preference downloadLocation;

        public SettingsFragment() {
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.prefs);

            findPreference("release_type_global").setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {
                    RepoLoader.getInstance().setReleaseTypeGlobal((String) newValue);
                    return true;
                }
            });

            CheckBoxPreference prefDisableResources = (CheckBoxPreference) findPreference("disable_resources");
            prefDisableResources.setChecked(mDisableResourcesFlag.exists());
            prefDisableResources.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {
                    boolean enabled = (Boolean) newValue;
                    if (enabled) {
                        try {
                            //noinspection ResultOfMethodCallIgnored
                            mDisableResourcesFlag.createNewFile();
                        } catch (IOException e) {
                            Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_SHORT).show();
                        }
                    } else {
                        //noinspection ResultOfMethodCallIgnored
                        mDisableResourcesFlag.delete();
                    }
                    return (enabled == mDisableResourcesFlag.exists());
                }
            });

            // TODO maybe enable again after checking the implementation
            //downloadLocation = findPreference("download_location");
            //downloadLocation.setOnPreferenceClickListener(this);
        }

        @Override
        public void onResume() {
            super.onResume();

            getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
        }

        @Override
        public void onPause() {
            super.onPause();

            getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
        }

        @Override
        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
            if (key.equals("theme")) getActivity().recreate();
        }

        @Override
        public boolean onPreferenceClick(Preference preference) {
            if (preference.getKey().equals(downloadLocation.getKey())) {
                if (checkPermissions()) {
                    mClickedPreference = downloadLocation;
                    return false;
                }

                new FolderChooserDialog.Builder((SettingsActivity) getActivity())
                        .cancelButton(android.R.string.cancel)
                        .initialPath(XposedApp.getDownloadPath())
                        .show();
            }

            return true;
        }

        private boolean checkPermissions() {
            if (Build.VERSION.SDK_INT < 23) return false;

            if (ActivityCompat.checkSelfPermission(getContext(),
                    Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0);
                return true;
            }
            return false;
        }

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

            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                if (mClickedPreference != null) {
                    new android.os.Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            onPreferenceClick(mClickedPreference);
                        }
                    }, 500);
                }
            } else {
                Toast.makeText(getActivity(), R.string.permissionNotGranted, Toast.LENGTH_LONG).show();
            }
        }
    }
}