How update View TextView with timer Android runnable example
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Update TextView by runnable. Handler, runnable, timer Android example.
main.xml
public class TimerActivity extends Activity {
TextView hTextView;
Button hButton, hButtonStop;
private Handler mHandler = new Handler();
private int nCounter = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hTextView = (TextView)findViewById(R.id.idTextView);
hButton = (Button)findViewById(R.id.idButton);
hButton.setOnClickListener(mButtonStartListener);
hButtonStop = (Button)findViewById(R.id.idButtonStop);
hButtonStop.setOnClickListener(mButtonStopListener);
} // end onCreate
View.OnClickListener mButtonStartListener = new OnClickListener() {
public void onClick(View v) {
try {
mHandler.removeCallbacks(hMyTimeTask);
// Parameters
// r The Runnable that will be executed.
// delayMillis The delay (in milliseconds) until the Runnable will be executed.
mHandler.postDelayed(hMyTimeTask, 1000); // delay 1 second
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
private Runnable hMyTimeTask = new Runnable() {
public void run() {
nCounter++;
hTextView.setText("Hallo from thread counter: " + nCounter);
}
};
/**
*
*/
View.OnClickListener mButtonStopListener = new OnClickListener() {
public void onClick(View v) {
mHandler.removeCallbacks(hMyTimeTask);
}
};
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/idTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button android:text="Button"
android:id="@+id/idButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/idButtonStop"
android:text="Stop"></Button>
</LinearLayout>
397LW NO topic_id
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Další témata ....(Topics)
Put your sglite database to Android Eclipse project folder named Assets.
On device will copy database file to application folder as this example:
On device will copy database file to application folder as this example:
public void createDatabase(Context myContext) throws IOException {
String sPackName = myContext.getPackageName();
InputStream assetsDB = myContext.getAssets().open("myDatabase");
OutputStream dbOut = new FileOutputStream("/data/data/"+sPackName+"/database");
byte[] buffer = new byte[1024];
int length;
while ((length = assetsDB.read(buffer))>0){
dbOut.write(buffer, 0, length);
}
dbOut.flush();
dbOut.close();
assetsDB.close();
}
No executable code found at line ....
Try one from this solution:
1.) uninstall app from test device, try to debugg app
or
2.) open module gradle file and set minifyEnabled to false in debug condition
Try one from this solution:
1.) uninstall app from test device, try to debugg app
or
2.) open module gradle file and set minifyEnabled to false in debug condition
debug {
minifyEnabled false
}
Add and shuffle elements in LinkedList or ArrayList Java basic example.
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = {"nothing", "Hello", "people"
, "bye-bye", "hello", "world!", "End" };
List<String> arrayList = new LinkedList<String>();
for(String s: arrayOfString)
arrayList.add(s);
Collections.shuffle(arrayList);
System.out.println(arrayList);
}
}
/*
[hello, world!, bye-bye, nothing, people, End, Hello]
*/
Issue: After after renaming package this problem occurred "R cannot be resolved to a variable".
Solution: Try Clean your project Project » Clean » Clean projects selected below » select your project and click OK.
Try to delete the invalid code and type it again:
Solution: Try Clean your project Project » Clean » Clean projects selected below » select your project and click OK.
Try to delete the invalid code and type it again:
LinearLayout layout = (LinearLayout) findViewById(R.id.layout); // delete R.id.layout
LinearLayout layout = (LinearLayout) findViewById();
LinearLayout layout = (LinearLayout) findViewById(R.id.layout); // re-write this code R.id.layout
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Spam v komentářích je nepříjemný a zatěžuje server. Jednou z metod, jak jej omezit je povolit přidávat komentáře jen registrovaným členům. Toho ve Wordpress dosáhneme v administraci z menu Settings - Discussion kde zaškrtneme políčko Users must be registered and logged in to comment a nastaveni uložíme.
Editace: 22.5.2020 - 17:00
Počet článků v kategorii: 397
Url:how-update-view-textview-with-timer-android-runnable-example
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