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我試圖做一個應用程序來打開和關閉WiFi。我有以下代碼。每次運行它都會崩潰。不能理解爲什麼。 API - 26Android:WIFI開啓和關閉應用程序崩潰(JAVA)
這是MainActivity.java
package com.example.fahad.test;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.ToggleButton;
public class MainActivity extends AppCompatActivity {
ToggleButton toggleButton;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.turn_on_off_wifi_programmatically);
toggleButton = (ToggleButton) findViewById(R.id.toggleButton);
textView = (TextView) findViewById(R.id.text_view);
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);
}
}
}
請幫助我與此有關。由於
安置自己的堆棧跟蹤 –
使用logcat的檢查與碰撞相關的Java堆棧跟蹤:https://stackoverflow.com/questions/23353173/unfortunately-myapp都具有一個 - 停止 - 如何-可以-I-解決,這 – CommonsWare