Timer task TimerTask run cancel Android example
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Update TextView from TimerTask, Handler, schedule, run, cancel TimerTask, Android example
public class TimerActivity extends Activity {
TimerTask mTimerTask;
final Handler handler = new Handler();
Timer t = new Timer();
TextView hTextView;
TableRow hTableRow;
Button hButton, hButtonStop;
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) {
doTimerTask();
}
};
View.OnClickListener mButtonStopListener = new OnClickListener() {
public void onClick(View v) {
stopTask();
}
};
public void doTimerTask(){
mTimerTask = new TimerTask() {
public void run() {
handler.post(new Runnable() {
public void run() {
nCounter++;
// update TextView
hTextView.setText("Timer: " + nCounter);
Log.d("TIMER", "TimerTask run");
}
});
}};
// public void schedule (TimerTask task, long delay, long period)
t.schedule(mTimerTask, 500, 3000); //
}
public void stopTask(){
if(mTimerTask!=null){
hTextView.setText("Timer canceled: " + nCounter);
Log.d("TIMER", "timer canceled");
mTimerTask.cancel();
}
}
}
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Další témata ....(Topics)
RelativeLayout like parent, child Srollview is centered horizontal.
Second RelativeLayout in SrollView have gravity center, every child will centered horizontally and vertically.
Second RelativeLayout in SrollView have gravity center, every child will centered horizontally and vertically.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center_horizontal">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/scrollView2" >
<RelativeLayout
android:layout_width="320dp"
android:layout_height="wrap_content"
android:background="#e6f825"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>
Activity.java
\res\layout\main.xml
location TouchImageView\src\cz\okhelp\TouchImageView\TouchImageView.java
public class A extends Activity{
Bitmap bm;
TouchImageView touch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bm = BitmapFactory.decodeResource(getResources(), R.drawable.chinese_sky_map);
touch = (TouchImageView)findViewById(R.id.myImageView);
touch.setImageBitmap(bm);
}
}
\res\layout\main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello" />
<cz.okhelp.TouchImageView.TouchImageView
android:id="@+id/myImageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
location TouchImageView\src\cz\okhelp\TouchImageView\TouchImageView.java
public class TouchImageView extends ImageView {
Context context;
// constructor wihtout using *.xml file
// public TouchImageView(Context context) {
// super(context);
// }
// constructor with xml file
public TouchImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
super.setClickable(true);
this.context = context;
}
}
Problem:
You have two class with similar names HeadLinesFragment and HeadMyLinesFragment with OnHeadlineSelectedListener.
Check if call correct class in MainActivity.
For example if use HeadMyLinesFragment change implement to HeadMyLinesFragment too!
You have two class with similar names HeadLinesFragment and HeadMyLinesFragment with OnHeadlineSelectedListener.
Check if call correct class in MainActivity.
For example if use HeadMyLinesFragment change implement to HeadMyLinesFragment too!
public class MainActivity extends FragmentActivity
implements HeadLinesFragment.OnHeadlineSelectedListener {
// wrong implements you need correct class name
//implements HeadMyLinesFragment.OnHeadlineSelectedListener
//............
HeadMyLinesFragment firstFragment = new HeadMyLinesFragment(); // because in code using HeadMyLinesFragment
Spinner, ArrayAdapter, setOnItemSelectedListener, onItemSelected, setDropDownViewResource
MainClass.java
strings.xml
MainClass.java
public class Vypocet extends Activity {
Spinner hSpinnerMetry;
// .......
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
hSpinnerMetry = (Spinner) findViewById(R.id.idSpinnerMetry);
ArrayAdapter<CharSequence> adapterMetry = ArrayAdapter.createFromResource(
this, R.array.metry_array, android.R.layout.simple_spinner_item);
adapterMetry.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
hSpinnerMetry.setAdapter(adapterMetry);
hSpinnerMetry.setOnItemSelectedListener(
new OnItemSelectedListener() {
public void onItemSelected(
AdapterView<?> parent, View view, int position, long id) {
int nPos = position;
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
}
strings.xml
<string-array name="metry_array">
<item>m</item>
<item>dm</item>
<item>cm</item>
<item>mm</item>
</string-array>
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();
}
};
}
Editace: 2011-10-03 13:57:17
Počet článků v kategorii: 397
Url:timer-task-timertask-run-cancel-android-example
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