我想在广播接收器的每个活动上连续检查互联网连接。我已经编写了代码，它完全正常工作。但是我想在每个活动中使用它。如何修改此代码？
public class MainActivity extends Activity {
private static final String LOG_TAG = "CheckNetworkStatus";
private NetworkChangeReceiver receiver;
private boolean isConnected = false;
private TextView networkStatus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
receiver = new NetworkChangeReceiver();
registerReceiver(receiver, filter);
networkStatus = (TextView) findViewById(R.id.networkStatus);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
protected void onDestroy() {
Log.v(LOG_TAG, "onDestory");
super.onDestroy();
unregisterReceiver(receiver);
}
public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
Log.v(LOG_TAG, "Receieved notification about network status");
isNetworkAvailable(context);
}
private boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
if(!isConnected){
Log.v(LOG_TAG, "Now you are connected to Internet!");
networkStatus.setText("Now you are connected to Internet!");
isConnected = true;
//do your processing here ---
//if you need to post any data to the server or get status
//update from the server
}
return true;
}
}
}
}
Log.v(LOG_TAG, "You are not connected to Internet!");
networkStatus.setText("You are not connected to Internet!");
isConnected = false;
return false;
}
}
}
答案 0 :(得分：5)
我想在每个活动中使用它。如何修改此代码？
创建一个扩展BaseActivity的{{1}}类，然后使所有AppCompatActivity类扩展此BaseActivity类。将您的代码用于检查Activity课程中的互联网连接。干杯：）
答案 1 :(得分：0)
创建服务。在启动器活动中启动服务，并将网络检查代码放入该服务中。
公共类NetworkServiceExtends Service {
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
//register receiver here
// connection check code
return START_STICKY;
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public void onDestroy() {
super.onDestroy();
// unregister receiver
}
}
答案 2 :(得分：0)
您可以将BroadcastReceiver放入其自己的类中，然后在您的Manifest中声明/注册它。这样它将分享您的应用程序的生命周期。
另一个好处是您不必担心取消注册，因此您不必担心内存泄漏。
答案 3 :(得分：0)
公共类BaseActivity扩展了AppCompatActivity {
private static final int WIFI_ENABLE_REQUEST = 0x1006;
private BroadcastReceiver mNetworkDetectReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
checkInternetConnection();
}
};
private AlertDialog mInternetDialog;
private boolean isConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
isConnected = false;
registerReceiver(mNetworkDetectReceiver, new IntentFilter(android.net.ConnectivityManager.CONNECTIVITY_ACTION));
}
@Override
protected void onDestroy() {
unregisterReceiver(mNetworkDetectReceiver);
super.onDestroy();
}
private void checkInternetConnection() {
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = manager.getActiveNetworkInfo();
if (ni != null && ni.getState() == NetworkInfo.State.CONNECTED) {
isConnected =true;
showNoConnectionSnackBar("Connected", isConnected, 1500);
} else {
isConnected= false;
showNoConnectionSnackBar("No active Internet connection found.", isConnected,6000);
}
}
private void showNoConnectionSnackBar(String message, boolean isConnected, int duration) {
Snackbar snackbar = Snackbar.make(findViewById(android.R.id.content),
message, duration);
View sbView = snackbar.getView();
TextView textView = (TextView) sbView
.findViewById(android.support.design.R.id.snackbar_text);
textView.setTextColor(ContextCompat.getColor(this, android.R.color.white));
if (isConnected){
sbView.setBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
}else{
sbView.setBackgroundColor(getResources().getColor(R.color.google_button_color));
snackbar.setAction("Turn On", new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent internetOptionsIntent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);
startActivityForResult(internetOptionsIntent, WIFI_ENABLE_REQUEST);
}
});
snackbar.setActionTextColor(getResources().getColor(R.color.colorPrimary));
}
snackbar.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == WIFI_ENABLE_REQUEST) {
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
}
答案 4 :(得分：0)
步骤1.将JitPack存储库添加到构建文件中将其添加到存储库末尾的root build.gradle中：
DF2 <- data.frame(Before = factor(c("Bad", "Bad", "Good", "Good", "Bad", "Bad")),
Now = factor(c("Good", "Good", "Good", "Bad", "Bad", "Good")),
Change = factor(c("Better", "Better", "No change", "Worse", "No change", "Better")))
第2步。添加依赖项
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
如果您不覆盖Application类，请编辑清单文件以在标记中设置android：name，如下所示：
dependencies {
implementation 'com.github.SumonHub:EagleEye:1.0.0'
}
如果您确实覆盖了Application类，请如下进行更改以扩展EagleEyeApplication（如果可能）：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp">
<application
android:name="org.sumon.eagleeye.EagleEyeApplication" >
...
</application>
</manifest>
在您的活动/片段中获得如下状态
public class MyApplication extends EagleEyeApplication { ... }
更多信息here