将代码移动到活动Java类(将两个Java类合并为一个)

Question

我有两个类的代码

第一类是ExampleBroadcastReceiver:

public class ExampleBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
boolean noConnectivity = intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false
);
if (noConnectivity) {
Toast.makeText(context, "Disconnected", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(context, "Connected", Toast.LENGTH_SHORT).show();
}
}
}
}

第二个类是MainActivity:

public class MainActivity extends AppCompatActivity {
ExampleBroadcastReceiver exampleBroadcastReceiver = new ExampleBroadcastReceiver();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onStart() {
super.onStart();
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(exampleBroadcastReceiver, filter);
}
@Override
protected void onStop() {
super.onStop();
unregisterReceiver(exampleBroadcastReceiver);
}
}

我如何通过将ExampleBroadcastReceiver类的代码传递给MainActivity来使两个类合并为一个?这可能吗?请不要问为什么。谢谢。

Answer 1

使用java接口处理MainActivity中发生在ExampleBroadcastReceiver中的事件。这样你就不需要合并类来共享基于事件的数据。

public class ExampleBroadcastReceiver extends BroadcastReceiver {
public interface ConnectivityMonitorCallback {
void onConnectivityChanged(boolean connectivity);
}
public ConnectivityMonitorCallback callback;
public ExampleBroadcastReceiver(@NonNull ConnectivityMonitorCallback eventCallback) {
callback = eventCallback;
}
@Override
public void onReceive(Context context, Intent intent) {
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
boolean noConnectivity = intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false
);
callback.onConnectivityChanged(noConnectivity);
}
}
}

最后在MainActivity中处理事件。

public class MainActivity extends AppCompatActivity {
ExampleBroadcastReceiver exampleBroadcastReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Define event handling code here which occurs in ExampleBroadcastReceiver
exampleBroadcastReceiver = new ExampleBroadcastReceiver(new ExampleBroadcastReceiver.ConnectivityMonitorCallback {
@Override
void onConnectivityChanged(boolean connectivity) {
// Handle the event that occured in ExampleBroadcastReceiver
}
});
}
@Override
protected void onStart() {
super.onStart();
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(exampleBroadcastReceiver, filter);
}
@Override
protected void onStop() {
super.onStop();
unregisterReceiver(exampleBroadcastReceiver);
}
}