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)
If You create new xml file with prefix _ , for example _style.xml and You to clean project (Project->Clean), than package in folder project\gen will deleted with R.java class and new R.java not be created.
For to solving this problem You have to rename file without prefix _ as style.xml or name what You need and rebuild project.
If some ID cannot be resolved or is not a field get error occurence
You have to delete import android.R; in Activity.class if was inserted,
when this error is displayed.
For to solving this problem You have to rename file without prefix _ as style.xml or name what You need and rebuild project.
If some ID cannot be resolved or is not a field get error occurence
You have to delete import android.R; in Activity.class if was inserted,
when this error is displayed.
public class MainActivity extends Activity implements OnClickListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout layout = (LinearLayout) findViewById(R.id.layout);
RadioGroup radioGroup = new RadioGroup(this);
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
layout.addView(radioGroup, p);
RadioButton radioButtonView = new RadioButton(this);
radioButtonView.setText("RadioButton");
radioButtonView.setOnClickListener(this);
radioGroup.addView(radioButtonView, p);
RadioButton radioButtonView2 = new RadioButton(this);
radioButtonView2.setText("RadioButton2");
radioButtonView2.setOnClickListener(mThisButtonListener);
radioGroup.addView(radioButtonView2, p);
}
public void onClick(View view) {
try {
String s = ((RadioButton) view).getText().toString();
Toast.makeText(MainActivity.this, "This is: " + s,
Toast.LENGTH_LONG).show();
}
catch (Exception e1) {
e1.printStackTrace();
}
}
private OnClickListener mThisButtonListener = new OnClickListener() {
public void onClick(View v) {
String s = ((RadioButton) v).getText().toString();
Toast.makeText(MainActivity.this, "Hello from 2!" + s,
Toast.LENGTH_LONG).show();
}
};
}
getContext() getApplicationContext() method Java Android example source
Context myContext_1 = ThisClassName.this; // to open a Dialog
Context myContext_2 = getContext();
Context myContext_3 = this.getContext();
Context myContext_4 = this;
Context myContext_5 = this.getApplicationContext ();
OnClickListener getImageBtnOnClick = new OnClickListener() {
public void onClick(View view) {
Context context = view.getContext();
}
};
// Toast
Toast.makeText(getApplicationContext(), "Context == getApplicationContext "
, Toast.LENGTH_SHORT).show();
// store Context in public class
public class MyActivity extends Activity {
public static Context myCnt = null;
...
protected void onCreate(Bundle icicle) {
...
myCnt = this;
MyStorage.setContext(myCnt);
// or
// MyStorage.setContext(this);
// cntxFromStorage == this
Context cntxFromStorage = MyStorage.getContext();
...
};
};
public class MyStorage
{
private static Context cntStorageContext = null;
public static Context getContext() {
return cntStorageContext;
}
public static void setContext(Context context) {
MyStorage.cntStorageContext = context;
}
};
class DataBaseHelper extends SQLiteOpenHelper {
// get MyActivity context
Context cnt = MyStorage.getContext();
}
Code look up at the Api Demos
android_fragments arguments attributes - three fragments on screen
android_fragments_alert_dialog
android_fragments_context_menu
android_fragments_custom_animation
android_fragments_dialog
android_fragments_dialog_or_activity
fragment_hide_show
fragment_layout
fragments_list_array
fragment_menu
android_fragments_get_result_from_fragment and tabs in two rows
android_fragments_recive_result
android_fragments_stack
fragment_tabs
android_fragments arguments attributes - three fragments on screen
android_fragments_alert_dialog
android_fragments_context_menu
android_fragments_custom_animation
android_fragments_dialog
android_fragments_dialog_or_activity
fragment_hide_show
fragment_layout
fragments_list_array
fragment_menu
android_fragments_get_result_from_fragment and tabs in two rows
android_fragments_recive_result
android_fragments_stack
fragment_tabs
Change the title associated with this activity. If this is a top-level activity, the title for its window will change. If it is an embedded activity, the parent can do whatever it wants with it.
String sTitle = "My new title";
setTitle(sTitle);
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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