1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.apis.app; 18 19 import com.example.android.apis.R; 20 21 import android.app.Activity; 22 import android.content.Intent; 23 import android.content.SharedPreferences; 24 import android.os.Bundle; 25 import android.preference.PreferenceManager; 26 import android.view.View; 27 import android.view.View.OnClickListener; 28 import android.widget.Button; 29 import android.widget.LinearLayout; 30 import android.widget.TextView; 31 import android.widget.LinearLayout.LayoutParams; 32 33 /** 34 * Demonstrates launching a PreferenceActivity and grabbing a value it saved. 35 */ 36 public class LaunchingPreferences extends Activity implements OnClickListener { 37 38 private static final int REQUEST_CODE_PREFERENCES = 1; 39 40 private TextView mCounterText; 41 42 @Override onCreate(Bundle savedInstanceState)43 protected void onCreate(Bundle savedInstanceState) { 44 super.onCreate(savedInstanceState); 45 46 /* 47 * If this were my app's main activity, I would load the default values 48 * so they're set even if the user does not go into the preferences 49 * screen. Another good place to call this method would be from a 50 * subclass of Application, so your default values would be loaded 51 * regardless of entry into your application (for example, a service or 52 * activity). 53 */ 54 PreferenceManager.setDefaultValues(this, R.xml.advanced_preferences, false); 55 56 // Simple layout 57 LinearLayout layout = new LinearLayout(this); 58 layout.setOrientation(LinearLayout.VERTICAL); 59 setContentView(layout); 60 61 // Create a simple button that will launch the preferences 62 Button launchPreferences = new Button(this); 63 launchPreferences.setText(getString(R.string.launch_preference_activity)); 64 launchPreferences.setOnClickListener(this); 65 layout.addView(launchPreferences, new LayoutParams(LayoutParams.MATCH_PARENT, 66 LayoutParams.WRAP_CONTENT)); 67 68 mCounterText = new TextView(this); 69 layout.addView(mCounterText, new LayoutParams(LayoutParams.MATCH_PARENT, 70 LayoutParams.WRAP_CONTENT)); 71 72 updateCounterText(); 73 } 74 onClick(View v)75 public void onClick(View v) { 76 77 // When the button is clicked, launch an activity through this intent 78 Intent launchPreferencesIntent = new Intent().setClass(this, AdvancedPreferences.class); 79 80 // Make it a subactivity so we know when it returns 81 startActivityForResult(launchPreferencesIntent, REQUEST_CODE_PREFERENCES); 82 } 83 84 @Override onActivityResult(int requestCode, int resultCode, Intent data)85 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 86 super.onActivityResult(requestCode, resultCode, data); 87 88 // The preferences returned if the request code is what we had given 89 // earlier in startSubActivity 90 if (requestCode == REQUEST_CODE_PREFERENCES) { 91 // Read a sample value they have set 92 updateCounterText(); 93 } 94 } 95 updateCounterText()96 private void updateCounterText() { 97 // Since we're in the same package, we can use this context to get 98 // the default shared preferences 99 SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this); 100 final int counter = sharedPref.getInt(AdvancedPreferences.KEY_MY_PREFERENCE, 0); 101 mCounterText.setText(getString(R.string.counter_value_is) + " " + counter); 102 } 103 } 104