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私は、スキャンしたWIFIアクセスポイントを表示するためのアプリを開発するプログラムを作成しました。私のアプリはエラーなしで実行されますが、残念ながら私はすべてを行ったように見えますが、結果を生成しません。私はすべてのファイルを添付しており、誰かが私が紛失しているものを指摘できるかどうかは分かります。乾杯！Android：スキャンしてWiFiリストを取得 - リストビューが表示されない
MainActivity.java
package com.example....;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.CompoundButton;
import android.widget.ListView;
import android.widget.TextView;
import android.content.Intent;
import android.content.IntentFilter;
import android.widget.ToggleButton;
import android.view.Menu;
import android.view.MenuItem;
import java.util.List;
import java.util.ArrayList;
import android.net.wifi.ScanResult;
public class MainActivity extends AppCompatActivity {
ToggleButton toggleButton;
TextView textView;
ListView list;
String len[];
public WifiManager wifi;
WifiReceiver receiverWifi;
StringBuilder sb = new StringBuilder();
private final Handler handler = new Handler();
private BroadcastReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
textView = (TextView) findViewById(R.id.textView);
list = (ListView)findViewById(R.id.listview);
receiverWifi = new WifiReceiver();
wifi.startScan();
registerReceiver(receiverWifi, new IntentFilter(
WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
if(wifi.isWifiEnabled()==false)
{
wifi.setWifiEnabled(true);
}
// #######################################################################################################################
toggleButton = (ToggleButton) findViewById(R.id.toggleButton);
toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
if (checked) {
textView.setText("WiFi is ON");
WifiManager wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifi.setWifiEnabled(true);
} else {
textView.setText("WiFi is OFF");
WifiManager wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifi.setWifiEnabled(false);
}
}
});
if (toggleButton.isChecked()) {
textView.setText("WiFi is ON");
WifiManager wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifi.setWifiEnabled(true);
} else {
textView.setText("WiFi is OFF");
WifiManager wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifi.setWifiEnabled(false);
}
// #######################################################################################################################
}
protected void onPause() {
unregisterReceiver(receiverWifi);
super.onPause();
}
protected void onResume() {
registerReceiver(receiverWifi, new IntentFilter(
WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
super.onResume();
}
class WifiReceiver extends BroadcastReceiver {
public void onReceive(Context c, Intent intent) {
ArrayList<String> connections=new ArrayList<String>();
ArrayList<Float> Signal_Strenth= new ArrayList<Float>();
List<ScanResult> wifiList = wifi.getScanResults();
wifiList = wifi.getScanResults();
len = new String[wifiList.size()];
for(int i = 0; i < wifiList.size(); i++){
len[i] = ((wifiList.get(i)).toString());
}
list.setAdapter(new ArrayAdapter<String>(getApplicationContext(),
android.R.layout.activity_list_item,len));
}
}
}activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example......"
tools:layout_editor_absoluteY="81dp"
tools:layout_editor_absoluteX="0dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="WiFi Network Status"
android:id="@+id/textView"
tools:layout_constraintTop_creator="1"
android:layout_marginStart="16dp"
android:layout_marginTop="26dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginLeft="16dp" />
<ToggleButton
android:id="@+id/toggleButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ToggleButton"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
android:layout_marginEnd="16dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="16dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginRight="16dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:layout_constraintTop_creator="1"
android:layout_marginStart="16dp"
android:layout_marginTop="110dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginLeft="16dp" />
<ListView
android:id="@+id/listview"
android:layout_width="0dp"
android:layout_height="0dp"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
android:layout_marginStart="15dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginEnd="15dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="18dp"
app:layout_constraintTop_toBottomOf="@+id/toggleButton"
tools:layout_constraintLeft_creator="1"
android:layout_marginBottom="20dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp" />
</android.support.constraint.ConstraintLayout>のAndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.....">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permisssion.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permisssion.ACCESS_COARSE_LOCATION"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
試しログ？私に話してください結果 –
@NguyễnTrungHiếu申し訳ありませんが、私は理解しませんでした。あなたは広げることができますか？ –
またはチュートリアルhttps://www.tutorialspoint.com/android/android_wi_fi.htmを参照してください。 –