Android wifi信号强弱检测

效果图
目录结构
AndroidManifest.xml中加入权限声明

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

布局文件 activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ff111627">    <ImageView        android:id="@+id/image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:src="@drawable/wifi_0" />RelativeLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {    private ImageView mImageView;    private Handler mHandler = new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if (msg.what == 0) {                checkWifiState();                sendEmptyMessageDelayed(0, 2000);            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mImageView = (ImageView) findViewById(R.id.image);        mHandler.sendEmptyMessageDelayed(0, 2000);    }    /**     * 检查wifi是否处开连接状态     * @return     */    public boolean isWifiConnect() {        ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo mWifiInfo = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);        return mWifiInfo.isConnected();    }    /**     * 检查wifi强弱并更改图标显示     */    public void checkWifiState() {        if (isWifiConnect()) {            WifiManager mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);            WifiInfo mWifiInfo = mWifiManager.getConnectionInfo();            int wifi = mWifiInfo.getRssi();//获取wifi信号强度            if (wifi > -50 && wifi < 0) {//最强                mImageView.setImageResource(R.drawable.wifi_2);            } else if (wifi > -70 && wifi < -50) {//较强                mImageView.setImageResource(R.drawable.wifi_1);            } else if (wifi > -80 && wifi < -70) {//较弱                mImageView.setImageResource(R.drawable.wifi_0);            } else if (wifi > -100 && wifi < -80) {//微弱                mImageView.setImageResource(R.drawable.wifi_0);            }        } else {            //无连接            mImageView.setImageResource(R.drawable.wifi_null);        }    }}

实现思路
1. 判断是否是wifi连接，获取系统的服务getSystemService(Context.CONNECTIVITY_SERVICE),得到NetworkInfo对象，调用该对象的isConnected()方法。
2. 检查wifi信号的强弱,获取WifiManager对象，得到WifiInfo对象，调用getRssi()方法获取wifi信号的强度。
3. 使用Handler每隔2000毫秒检查wifi状态，更新状态图标。

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