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      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.preference;
     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
     43     protected void onCreate(Bundle savedInstanceState) {
     44         super.onCreate(savedInstanceState);
     45 
     46         /*
     47          * These preferences have defaults, so before using them go apply those
     48          * defaults.  This will only execute once -- when the defaults are applied
     49          * a boolean preference is set so they will not be applied again.
     50          */
     51         PreferenceManager.setDefaultValues(this, R.xml.advanced_preferences, false);
     52 
     53         // Simple layout
     54         LinearLayout layout = new LinearLayout(this);
     55         layout.setOrientation(LinearLayout.VERTICAL);
     56         setContentView(layout);
     57 
     58         // Create a simple button that will launch the preferences
     59         Button launchPreferences = new Button(this);
     60         launchPreferences.setText(getString(R.string.launch_preference_activity));
     61         launchPreferences.setOnClickListener(this);
     62         layout.addView(launchPreferences, new LayoutParams(LayoutParams.MATCH_PARENT,
     63                 LayoutParams.WRAP_CONTENT));
     64 
     65         mCounterText = new TextView(this);
     66         layout.addView(mCounterText, new LayoutParams(LayoutParams.MATCH_PARENT,
     67                 LayoutParams.WRAP_CONTENT));
     68 
     69         updateCounterText();
     70     }
     71 
     72     public void onClick(View v) {
     73 
     74         // When the button is clicked, launch an activity through this intent
     75         Intent launchPreferencesIntent = new Intent().setClass(this, AdvancedPreferences.class);
     76 
     77         // Make it a subactivity so we know when it returns
     78         startActivityForResult(launchPreferencesIntent, REQUEST_CODE_PREFERENCES);
     79     }
     80 
     81     @Override
     82     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     83         super.onActivityResult(requestCode, resultCode, data);
     84 
     85         // The preferences returned if the request code is what we had given
     86         // earlier in startSubActivity
     87         if (requestCode == REQUEST_CODE_PREFERENCES) {
     88             // Read a sample value they have set
     89             updateCounterText();
     90         }
     91     }
     92 
     93     private void updateCounterText() {
     94         // Since we're in the same package, we can use this context to get
     95         // the default shared preferences
     96         SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
     97         final int counter = sharedPref.getInt(AdvancedPreferences.KEY_MY_PREFERENCE, 0);
     98         mCounterText.setText(getString(R.string.counter_value_is) + " " + counter);
     99     }
    100 }
    101