android指南针

来源：互联网发布：json(",")什么意思编辑：程序博客网时间：2024/04/28 07:39

主要利用方向传感器：

　　方向传感器返回三个角度：按照顺序

　　1.表示手机顶部与正北的夹角
　　values[0]: 方位角

　　2.表示手机顶部或尾部翘起的高度
　　values[1]: 倾斜角

　　3.表示手机左侧或者右侧抬起的高度
　　values[2]: 旋转角

　　思路：程序先准备一张指南针图片，改图片上方向指南针指向北方。接下来开发一个检测方向的传感器，程序检测到手机顶部绕z转过的多少度，让指南针图片反转过多少度，所以只需添加一张图片，并让图片总是反转方向传感器返回的第一个角度值既可

代码如下：
Welcome.java

package com.hhf.compass;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.ImageView;

public class Welcome extends Activity{
 
 private AlphaAnimation myAnimation_Alpha;
 private ImageView iv;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  iv = (ImageView) findViewById(R.id.ivStart);
  myAnimation_Alpha=new AlphaAnimation(1.0f, 0.1f);
  myAnimation_Alpha.setDuration(3000);
  myAnimation_Alpha.setAnimationListener(new Animation.AnimationListener() {
   @Override
   public void onAnimationStart(Animation animation) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void onAnimationRepeat(Animation animation) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void onAnimationEnd(Animation animation) {
    // TODO Auto-generated method stub
    Intent intent = new Intent(Welcome.this,Compass.class);
    startActivity(intent);
    finish();
   }
  });
 } 
 
 @Override
 public void onStart() {

  super.onStart();
  
  iv.startAnimation(myAnimation_Alpha);
 } 

}

Compass.java

package com.hhf.compass;


import android.app.Activity;
import android.content.Intent;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

public class Compass extends Activity implements SensorListener {
 private static final String TAG = "Compass";

 private ImageView ImgCompass;
 private TextView OrientText;
 private SensorManager sm = null;
 private RotateAnimation myAni = null;
 private float DegressQuondam = 0.0f;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.compass);
  
  OrientText = (TextView) findViewById(R.id.OrientText);
  ImgCompass = (ImageView) findViewById(R.id.ivCompass);
 }
 @Override
 public void onStart() {
  sm = (SensorManager) getSystemService(SENSOR_SERVICE);
  super.onStart();
  
 } 

 @Override
 protected void onResume() {
  super.onResume();
  sm.registerListener(this, SensorManager.SENSOR_ORIENTATION
   | SensorManager.SENSOR_ACCELEROMETER, SensorManager.SENSOR_DELAY_NORMAL);
 }

 @Override
 protected void onStop() {
  sm.unregisterListener(this);  
  super.onStop();
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  menu.add(0, 1, 1, "旋转").setIcon(R.drawable.icon);
  menu.add(0, 2, 2, "关于").setIcon(R.drawable.icon);
  menu.add(0, 3, 3, "退出").setIcon(R.drawable.quit);

  return super.onCreateOptionsMenu(menu);
 }
 
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  switch (item.getItemId()) {
  case 1:
   AniRotateImage(DegressQuondam + 90.0f);
   break;
  case 2: {
   Intent theActivity = new Intent(this, About.class);
         startActivity(theActivity);
   break;
  }
  case 3:
   finish();
   break;
  }

  return super.onOptionsItemSelected(item);
 }

 private void AniRotateImage(float fDegress) {
  myAni = new RotateAnimation(DegressQuondam, fDegress,
    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
    0.5f);
  myAni.setDuration(300);
  myAni.setFillAfter(true);// 为实现指南针效果，设置旋转后不还原原图
  ImgCompass.startAnimation(myAni);
  DegressQuondam = fDegress;
 }

 public void onSensorChanged(int sensor, float[] values) {
  synchronized (this) {
   if (sensor == SensorManager.SENSOR_ORIENTATION) {
    Log.d(TAG, "onSensorChanged: " + sensor + ", x: " + values[0]
      + ", y: " + values[1] + ", z: " + values[2]);

    // OrientText.setText("--- NESW ---");
    if (Math.abs(values[0] - DegressQuondam) < 1)
     return;
    
    switch ((int) values[0]) {
    case 0: // North 北
     OrientText.setText("正北");
     break;
    case 90: // East 东
     OrientText.setText("正东");
     break;
    case 180: // South 南
     OrientText.setText("正南");
     break;
    case 270: // West 西
     OrientText.setText("正西");
     break;
    default: {
     int v = (int) values[0];
     if (v > 0 && v < 90) {
      OrientText.setText("北偏东" + v);
     }

     if (v > 90 && v < 180) {
      v = 180 - v;
      OrientText.setText("南偏东" + v);
     }

     if (v > 180 && v < 270) {
      v = v - 180;
      OrientText.setText("南偏西" + v);
     }
     if (v > 270 && v < 360) {
      v = 360 - v;
      OrientText.setText("北偏西" + v);
     }
    }
    }

    ((TextView) findViewById(R.id.OrientValue)).setText(String.valueOf(values[0]));

    if (DegressQuondam != -values[0])
     AniRotateImage(-values[0]);
   }

   // if (sensor == SensorManager.SENSOR_ACCELEROMETER) { // //}

  }
 }

 public void onAccuracyChanged(int sensor, int accuracy) {
  Log.d(TAG, "onAccuracyChanged: " + sensor + ", accuracy: " + accuracy);
 }
}

About.java

package com.hhf.compass;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;

public class About extends Activity {

 public void onCreate(Bundle savedInstanceState) {
  StringBuilder sb = new StringBuilder(getString(R.string.app_name));
  sb.append(" ");
  sb.append(getString(R.string.app_ver));
  
  super.onCreate(savedInstanceState);

  this.requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.about);
  
  
  ((TextView) findViewById(R.id.tvTitle)).setText(sb.toString());
  ((TextView) findViewById(R.id.tvContent)).setText(R.string.aboutContent);
  
  ((Button) findViewById(R.id.btnOk)).setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    finish();
   }
  });
 }
}

对应布局文件：
main.xml

<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ivStart"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:clickable="true"
    android:src="http://ranfeng0610.blog.163.com/blog/@drawable/compass" >

</ImageView>

compass.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/LinearLayout01"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/OrientText"
        android:layout_width="fill_parent"
        android:layout_height="90dp"
        android:gravity="center"
        android:text="NESW"
        android:textColor="#ffffff"
        android:textSize="25px"
        android:textStyle="bold" >
    </TextView>

    <ImageView
        android:id="@+id/ivCompass"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:src="http://ranfeng0610.blog.163.com/blog/@drawable/bg" >
    </ImageView>

    <TextView
        android:id="@+id/OrientValue"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:gravity="right|center_vertical"
        android:text="NESW"
        android:textColor="#ffffff"
        android:textSize="12px"
        android:textStyle="bold" >
    </TextView>

</LinearLayout>

about.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/TableLayout"
    android:layout_width="280dp"
    android:layout_height="200dp" >

    <TableRow
        android:id="@+id/TRtitle"
        android:layout_width="fill_parent"
        android:layout_height="80dp" >

        <TableLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/TLtitle"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >

            <TableRow
                android:id="@+id/TRtt"
                android:layout_width="fill_parent"
                android:layout_height="80dp" >

                <ImageView
                    android:id="@+id/ImageView01"
                    android:layout_width="80dp"
                    android:layout_gravity="center"
                    android:src="http://ranfeng0610.blog.163.com/blog/@drawable/pisces" >
                </ImageView>

                <TextView
                    android:id="@+id/tvTitle"
                    android:layout_width="200dp"
                    android:layout_height="70dp"
                    android:gravity="center"
                    android:text="@string/app_name"
                    android:textColor="#ffffff"
                    android:textSize="25px"
                    android:textStyle="bold" >
                </TextView>
            </TableRow>
        </TableLayout>
    </TableRow>

    <TableRow
        android:id="@+id/TRcontent"
        android:layout_width="fill_parent"
        android:layout_height="90dp" >

        <TextView
            android:id="@+id/tvContent"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:text="@+id/TextView02" >
        </TextView>
    </TableRow>

    <TableRow
        android:id="@+id/TRMarquee"
        android:layout_width="fill_parent"
        android:layout_height="90dp" >

        <TableLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/TLMarquee"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >

            <TableRow
                android:id="@+id/TRtm"
                android:layout_width="fill_parent"
                android:layout_height="50dp"
                android:gravity="center_horizontal" >

                <TextView
                    android:id="@+id/tvQueen"
                    android:layout_width="160dp"
                    android:layout_height="30dp"
                    android:ellipsize="marquee"
                    android:gravity="center_horizontal"
                    android:singleLine="true"
                    android:text=".....all pisces....."
                    android:textColor="#ffffff"
                    android:textSize="18px"
                    android:textStyle="bold" >
                </TextView>
            </TableRow>
        </TableLayout>
    </TableRow>

    <TableRow
        android:id="@+id/TRButton"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:gravity="center_horizontal" >

        <TableLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/TLButton"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >

            <TableRow
                android:id="@+id/TRtb"
                android:layout_width="fill_parent"
                android:layout_height="50dp"
                android:gravity="center_horizontal" >

                <Button
                    android:id="@+id/btnOk"
                    android:layout_width="100dp"
                    android:layout_height="50dp"
                    android:text="@string/alert_ok" >
                </Button>
            </TableRow>
        </TableLayout>
    </TableRow>

</TableLayout>

style.xml

<?xml version="1.0" encoding="UTF-8"?>
<resources>
 <style name="style_NavCompass">
  <item name="android:windowFullscreen">true</item>
  <item name="android:windowNoTitle">true</item>
  <item name="android:windowBackground">@drawable/black</item>
  <item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item>
 </style>
 
</resources>

清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hhf.compass"
    android:versionCode="1"
    android:versionName="1.0" >

    <application
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name=".Welcome"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/style_NavCompass" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Compass"
            android:screenOrientation="portrait"
            android:theme="@style/style_NavCompass" >
        </activity>
        <activity
            android:name="com.hhf.compass.About"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.Dialog" >
        </activity>
    </application>

    <uses-sdk android:minSdkVersion="3" />

    <uses-permission android:name="android.permission.WAKE_LOCK" >
    </uses-permission>

</manifest>

指南针效果：