Android Studio学习路程（13）

Posted 2020-11-27 mashuxia

今天在网上学习了几个新的知识点，一个是传感器，一个是添加音效池，一个是实现震动的效果。

首先，安卓有很多自带的传感器，有加速度传感器等等，

private SensorManager sensorManager;
private Sensor sensor;
...
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_GAME_ROTATION_VECTOR);
这个是安卓官方文件给出的一个例子，添加音效池和添加震动的方法是差不多的；下面是一个实现微信摇一摇功能的APP的代码：

 1 package com.example.hp.wechat_shake;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 import android.widget.Button;
 8 
 9 public class MainActivity extends ActionBarActivity implements View.OnClickListener {
10 
11     private Button mButton;
12 
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17 
18         //初始化控件
19         initUI();
20 
21     }
22     private void initUI() {
23         mButton = (Button) findViewById(R.id.btn_shake);
24         findViewById(R.id.btn_shake).setOnClickListener(this);
25     }
26 
27     @Override
28     public void onClick(View view) {
29         Intent intent = new Intent();
30         switch(view.getId()){
31             case R.id.btn_shake:
32                 intent.setClass(this,ShakeActivity.class);
33                 break;
34         }
35         startActivity(intent);
36     }
37 }

MainActivity

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context="com.example.hp.wechat_shake.MainActivity">
 8 
 9    <Button
10        android:id="@+id/btn_shake"
11        android:text="微信摇一摇"
12        android:textSize="30dp"
13        android:layout_width="match_parent"
14        android:layout_height="65dp"/>
15 </RelativeLayout>

MainActivity_XML

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:background="#000"
 8     tools:context="com.example.hp.wechat_shake.ShakeActivity">
 9 
10     <ImageView
11         android:id="@+id/iv_shake_img"
12         android:layout_width="wrap_content"
13         android:layout_height="wrap_content"
14         android:src="@drawable/shakehideimg_man2"
15         android:layout_centerInParent="true"/>
16 
17     <LinearLayout
18         android:id="@+id/id_shake_layout"
19         android:layout_width="match_parent"
20         android:layout_height="match_parent"
21         android:orientation="vertical"
22         android:gravity="center">
23 
24         <ImageView
25             android:src="@drawable/shake_logo_up"
26             android:id="@+id/iv_shake_up"
27             android:layout_width="wrap_content"
28             android:layout_height="wrap_content"/>
29 
30         <ImageView
31             android:src="@drawable/shake_logo_down"
32             android:id="@+id/iv_shake_down"
33             android:layout_width="wrap_content"
34             android:layout_height="wrap_content"/>
35 
36     </LinearLayout>
37 
38 </RelativeLayout>

ShakeActivity_XML

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest package="com.example.hp.wechat_shake"
 3           xmlns:android="http://schemas.android.com/apk/res/android">
 4     /*******振动器使用权限**********/
 5     <uses-permission android:name="android.permission.VIBRATE"/>
 6 
 7     <application
 8         android:allowBackup="true"
 9         android:icon="@mipmap/ic_launcher"
10         android:label="@string/app_name"
11         android:supportsRtl="true"
12         android:theme="@style/AppTheme">
13         <activity android:name=".MainActivity">
14             <intent-filter>
15                 <action android:name="android.intent.action.MAIN"/>
16 
17                 <category android:name="android.intent.category.LAUNCHER"/>
18             </intent-filter>
19         </activity>
20         <activity android:name=".ShakeActivity">
21         </activity>
22     </application>
23 
24 </manifest>

manifest_XML

  1 package com.example.hp.wechat_shake;
  2 
  3 import android.content.Context;
  4 import android.hardware.Sensor;
  5 import android.hardware.SensorEvent;
  6 import android.hardware.SensorEventListener;
  7 import android.hardware.SensorManager;
  8 import android.media.AudioManager;
  9 import android.media.SoundPool;
 10 import android.os.Bundle;
 11 import android.os.Vibrator;
 12 import android.support.v7.app.ActionBarActivity;
 13 import android.view.animation.Animation;
 14 import android.view.animation.AnimationSet;
 15 import android.view.animation.TranslateAnimation;
 16 import android.widget.ImageView;
 17 
 18 public class ShakeActivity extends ActionBarActivity implements SensorEventListener{
 19 
 20     private ImageView mShakeImg;
 21     private ImageView mShakeUp;
 22     private ImageView mShakeDown;
 23     private SensorManager mSensorManager;
 24     private Sensor mSensor;
 25     private AnimationSet mSetUp;
 26     private AnimationSet mSetDown;
 27     private SoundPool mSoundPool;
 28     private int loadId;
 29     private Vibrator mVibrator;
 30 
 31     @Override
 32     protected void onCreate(Bundle savedInstanceState) {
 33         super.onCreate(savedInstanceState);
 34         setContentView(R.layout.activity_shake);
 35         //初始化控件
 36         initUI();
 37         //初始化动画
 38         initAnimation();
 39         //初始化音效池
 40         initSoundPool();
 41         //初始化振动器
 42         initVibrator();
 43 
 44     }
 45 
 46     private void initVibrator() {
 47         //获取振动器管理者对象
 48         mVibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
 49     }
 50 
 51     private void initSoundPool() {
 52         //获取音效池对象
 53         mSoundPool = new SoundPool(2, AudioManager.STREAM_MUSIC,0);//2代表音效池最多下载两个播放器，中间的参数代表播放器的类型，最后一个0代表源文件的一个优先级
 54         //加载音效到音效池当中
 55         loadId=mSoundPool.load(this,R.raw.awe,1);
 56 
 57     }
 58 
 59     private void initUI() {
 60         mShakeImg = (ImageView) findViewById(R.id.iv_shake_img);
 61         mShakeUp = (ImageView) findViewById(R.id.iv_shake_up);
 62         mShakeDown = (ImageView) findViewById(R.id.iv_shake_down);
 63         //1.获取传感器管理者对象
 64         mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
 65         //2.获取指定的传感器对象---加速度传感器
 66         mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
 67         //3.注册传感器对象
 68         mSensorManager.registerListener(this,mSensor,SensorManager.SENSOR_DELAY_NORMAL);
 69 
 70     }
 71 
 72     @Override
 73     protected void onDestroy() {
 74         //4.注销传感器对象
 75         super.onDestroy();
 76         mSensorManager.unregisterListener(this);
 77     }
 78 
 79     @Override
 80     public void onSensorChanged(SensorEvent sensorEvent) {
 81         /*当传感器的数值发生改变时会调用的方法（函数）*/
 82         float[] values = sensorEvent.values;
 83         float x = values[0];
 84         float y = values[1];
 85         float z = values[3];
 86         int minValue = 12;
 87         if(Math.abs(x)>minValue||Math.abs(y)>minValue||Math.abs(z)>minValue){
 88             //开始震动
 89             long[]patten = {300,500};
 90             mVibrator.vibrate(patten,-1);
 91 
 92             //开始播放音效
 93             mSoundPool.play(loadId,1,1,1,0,1);
 94 
 95 
 96             //开始动画效果
 97             mShakeUp.startAnimation(mSetUp);
 98             mShakeDown.startAnimation(mSetDown);
 99 
100         }
101     }
102 
103     @Override
104     public void onAccuracyChanged(Sensor sensor, int i) {
105         /*当传感器的精度发生改变时会调用的方法*/
106     }
107 
108     private void initAnimation(){
109         //上面图片对应的动画效果
110         TranslateAnimation mAnimationUp = new TranslateAnimation(Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,1);
111         mAnimationUp.setDuration(500);//设置上面的图片向上的时间为5秒
112         TranslateAnimation mAnimationUpDown = new TranslateAnimation(Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,1,Animation.RELATIVE_TO_SELF,0);
113         mAnimationUpDown.setDuration(500);
114         mSetUp = new AnimationSet(true);
115         //将上面的一张图片的上下移动的动画效果放到一个集合里
116         mSetUp.addAnimation(mAnimationUp);
117         mSetUp.addAnimation(mAnimationUpDown);
118         //设置动画之间的执行时间差
119         mSetUp.setStartOffset(500);
120 
121         TranslateAnimation mAnimationDown = new TranslateAnimation(Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,-1);
122         mAnimationDown.setDuration(500);//设置上面的图片向上的时间为5秒
123         TranslateAnimation mAnimationDownUp = new TranslateAnimation(Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,-1,Animation.RELATIVE_TO_SELF,0);
124         mAnimationDownUp.setDuration(500);
125         mSetDown = new AnimationSet(true);
126         //将下面的一张图片的上下移动的动画效果放到一个集合里
127         mSetDown.addAnimation(mAnimationDown);
128         mSetDown.addAnimation(mAnimationDownUp);
129         //设置动画之间的执行时间差
130         mSetDown.setStartOffset(500);
131 
132     }
133 }

ShakeActivity