1 /*
2  * Copyright (C) 2013 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.os;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.view.View;
22 import android.hardware.Sensor;
23 import android.hardware.TriggerEvent;
24 import android.hardware.TriggerEventListener;
25 import android.hardware.SensorManager;
26 import android.os.Bundle;
27 import android.widget.TextView;
28 import com.example.android.apis.R;
29 
30 /**
31  * <h3>Application showing the Trigger Sensor API for the Significant Motion sensor. </h3>
32 
33 <p>This demonstrates the {@link android.hardware.SensorManager android.hardware.SensorManager
34    android.hardware.TriggerEventListener} class.
35 
36 <h4>Demo</h4>
37 OS / TriggerSensors
38 
39 <h4>Source files</h4>
40  * <table class="LinkTable">
41  *         <tr>
42  *             <td >src/com.example.android.apis/os/TriggerSensors.java</td>
43  *             <td >TriggerSensors</td>
44  *         </tr>
45  * </table>
46  */
47 
48 
49 class TriggerListener extends TriggerEventListener {
50     private Context mContext;
51     private TextView mTextView;
52 
TriggerListener(Context context, TextView textView)53     TriggerListener(Context context, TextView textView) {
54         mContext = context;
55         mTextView = textView;
56     }
57 
58     @Override
onTrigger(TriggerEvent event)59     public void onTrigger(TriggerEvent event) {
60         if (event.values[0] == 1) {
61             mTextView.append(mContext.getString(R.string.sig_motion) + "\n");
62             mTextView.append(mContext.getString(R.string.sig_motion_auto_disabled) + "\n");
63         }
64         // Sensor is auto disabled.
65     }
66 }
67 
68 public class TriggerSensors extends Activity {
69     private SensorManager mSensorManager;
70     private Sensor mSigMotion;
71     private TriggerListener mListener;
72     private TextView mTextView;
73 
74     @Override
onResume()75     protected void onResume() {
76         super.onResume();
77         if (mSigMotion != null && mSensorManager.requestTriggerSensor(mListener, mSigMotion))
78                 mTextView.append(getString(R.string.sig_motion_enabled) + "\n");
79     }
80 
81     @Override
onPause()82     protected void onPause() {
83         super.onPause();
84         // Call disable only if needed for cleanup.
85         // The sensor is auto disabled when triggered.
86         if (mSigMotion != null) mSensorManager.cancelTriggerSensor(mListener, mSigMotion);
87     }
88 
89 
90     /**
91      * Initialization of the Activity after it is first created.  Must at least
92      * call {@link android.app.Activity#setContentView setContentView()} to
93      * describe what is to be displayed in the screen.
94      */
95     @Override
onCreate(Bundle savedInstanceState)96     protected void onCreate(Bundle savedInstanceState) {
97         super.onCreate(savedInstanceState);
98         setContentView(R.layout.trigger_sensors);
99         mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
100         mSigMotion = mSensorManager.getDefaultSensor(Sensor.TYPE_SIGNIFICANT_MOTION);
101         mTextView = (TextView)findViewById(R.id.text);
102         mListener = new TriggerListener(this, mTextView);
103         if (mSigMotion == null) {
104             mTextView.append(getString(R.string.no_sig_motion) + "\n");
105         }
106     }
107 
108     @Override
onStop()109     protected void onStop() {
110         if (mSigMotion != null) mSensorManager.cancelTriggerSensor(mListener, mSigMotion);
111         super.onStop();
112     }
113 }
114