[英]How to get data from thread to activity in android
這是我的主題
public class ReadPaycardThread implements Runnable {
String applicationLabel = null;
}
我想在活動中使用這個變量值。
Runnable 不是線程,它只是一個“要執行的代碼”,但它可以在任何線程中執行。
class MainActivity extends Activity {
Handler mMainHandler;
public onCreate(..) {
mMainHandler = new Handler(Looper.getMainLooper()) {
@UiThread @MainThread
public void handleMessage(Message message) {
switch (message.what) {
case 1234: {
final String cApplicationLabel = (String)message.obj;
//YOU CAN USE THIS STRING IN ANY PLACE OF MainActivity like "TextView.setText(cApplicationLabel)"
break;
}
}
}
}
}
@AnyThread
public boolean sendToActivity() {
if (mMainHandler == null) return false;
final String cApplicationLabel = "TEST LABEL";
return mMainHandler.sendMessage(Message.obtain(mMainHandler, 1234, cApplicationLabel));
}
}
您可以從“看到”它的任何地方調用“ sendToActivity() ”,它會向 MainActivity 傳遞一個字符串
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