如何从 Java 类中回调 Activity?
例子:
public class TestClass{
String text = "Test";
public TestClass(Context context){
startActivity(new Intent(context, SomeActivity.class));
}
private void sendToSomeActivity(){
//Call some method of SomeActivity and pas text as string
}
}
当 sendToSomeActivity()
被调用时,我想回调已经启动的 SomeActivity
并将一些文本传递给 Activity。在 SomeActivity
我想使用文本。
注意:我要使用的 TestClass 对象已经在另一个类中创建。
如何做到这一点?
最佳答案
我选择的方案如下:
使用 BroadcastReceivers 在 Java 类和 Activity 之间进行通信。
例子:
public class SomeActivity extends Activity{
private MyBroadcastReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
receiver = new MyBroadcastReceiver();
this.registerReceiver(receiver, new IntentFilter(MyBroadcastReceiver.ACTION));
}
@Override
public void onDestroy() {
super.onDestroy();
this.unregisterReceiver(receiver);
}
private class MyBroadcastReceiver extends BroadcastReceiver{
public static final String ACTION = "com.example.ACTION_SOMETHING"
@Override
public void onReceive(Context context, Intent intent) {
String test = intent.getStringExtra("dataToPass");
}
}
}
public class TestClass{
private String test = "TEST";
private Context context;
public TestClass(Context context){
this.context = context;
}
private void sendToSomeActivity(){
Intent intent = new Intent();
intent.setAction(SomeActivity.MyBroadcastReceiver.ACTION);
intent.putExtra("dataToPass", test);
context.sendBroadcast(intent);
}
}
关于Android 从 java 类回调到 Activity,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29257546/