獲取wifi訊號強度

import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private WifiManager wifiManager;
    private int level;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
        WifiInfo wifiInfo = wifiManager.getConnectionInfo();
        //獲得訊號強度值
        level = wifiInfo.getRssi();
        //根據獲得的訊號強度傳送資訊
        if (level <= 0 && level >= -50) {
            Toast.makeText(MainActivity.this,
                    "訊號強度：" + level + " 訊號最好", Toast.LENGTH_SHORT)
                    .show();
        } else if (level < -50 && level >= -70) {
            Toast.makeText(MainActivity.this,
                    "訊號強度：" + level + " 訊號較好", Toast.LENGTH_SHORT)
                    .show();
        } else if (level < -70 && level >= -80) {
            Toast.makeText(MainActivity.this,
                    "訊號強度：" + level + " 訊號一般", Toast.LENGTH_SHORT)
                    .show();
        } else if (level < -80 && level >= -100) {
            Toast.makeText(MainActivity.this,
                    "訊號強度：" + level + " 訊號較差", Toast.LENGTH_SHORT)
                    .show();
        } else {
            Toast.makeText(MainActivity.this,
                    "訊號強度：" + level + " 無訊號", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}
 

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

demo 地址    https://download.csdn.net/download/qq_36665856/10396770