ArrayList Collections Add new Item Sort Find Item Java example
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How add item to ArrayList, sort ArrayList, search find index of item in ArrayList, min(), max() Java basic example.
import java.util.ArrayList;
import java.util.Collections;
public class MainClass {
public static void main(String[] arg) {
String[] arrayOfString = {"nothing", "Hello", "people"
, "bye-bye", "hello", "world!", "End" };
ArrayList<String> arrayList = new ArrayList<String>();
for(String s: arrayOfString)
arrayList.add(s);
Collections.sort(arrayList);
// foreach
for (String str: arrayList)
System.out.println(str);
Object objMin = Collections.min(arrayList);
System.out.println("Min is: " + objMin);
Object objMax = Collections.max(arrayList);
System.out.println("Max is: " + objMax);
int index = Collections.binarySearch(arrayList, "people");
System.out.println("Index of people is: " + index);
}
}
/*
End
Hello
bye-bye
hello
nothing
people
world!
Min is: End
Max is: world!
Index of people is: 5
*/
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If you want save battery, select "Satelite map" from map menu and reduce the brightness of the display.
import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;
public class SoundManager
{
private SoundPool soundPool;
private int[] sm;
Context context;
public SoundManager(Context context) {
this.context = context;
soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 0);
sm = new int[2];
// fill your sounds
sm[0] = soundPool.load(context, R.raw.my_sound1, 1);
sm[1] = soundPool.load(context, R.raw.my_sound2, 1);
}
public final void playSound(int sound) {
AudioManager mgr = (AudioManager)context.getSystemService(
Context.AUDIO_SERVICE);
float streamVolumeCurrent =
mgr.getStreamVolume(AudioManager.STREAM_MUSIC);
float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
float volume = streamVolumeCurrent / streamVolumeMax;
soundPool.play(sm[sound], volume, volume, 1, 0, 1f);
}
public final void cleanUpIfEnd() {
sm = null;
context = null;
soundPool.release();
soundPool = null;
}
}
Try convert WAV file to MP3 format for example by Audacity sound editor and replay:
//audacity.sourceforge.net/help/faq_i18n?s=install&i=lame-mp3
//audacity.sourceforge.net/help/faq_i18n?s=install&i=lame-mp3
MediaPlayer mp = MediaPlayer.create(getApplicationContext(), R.raw.mymp3file);
mp.setLooping(true);
mp.start();
TableRow TableLayout table row add delete remove removeview addview get table row index indexOfChild create table row dynamically TextView dynamically Android example
Main.java
main.xml ScrollView, TableLayout, TableRow, TextView Android xml layout example
Main.java
TableLayout table = (TableLayout)findViewById(R.id.table);
TableRow row = (TableRow)findViewById(R.id.row);
// get table row index android.
int nIndex = table.indexOfChild(row);
table.removeView(row); // invisible and height == 0
// add row into same place
table.addView(row, nIndex); // visible
// add row into certain position
table.addView(row, 3); // visible
// create new TableRow dynamically
TableRow tr = new TableRow(this);
tr.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
// create own function for append TableRow
private void appendRow(TableLayout table) {
TableRow row = new TableRow(this);
TextView hLabel = new TextView(this);
hLabel.setText("Some text");
hLabel.setPadding(3, 3, 3, 3);
TextView hNextLabel = new TextView(this);
hNextLabel.setText("Next text");
hNextLabel.setPadding(3, 3, 3, 3);
hNextLabel.setGravity(Gravity.RIGHT | Gravity.TOP);
row.addView(hLabel, new TableRow.LayoutParams(1));
row.addView(hNextLabel, new TableRow.LayoutParams());
table.addView(row, new TableLayout.LayoutParams());
}
main.xml ScrollView, TableLayout, TableRow, TextView Android xml layout example
<ScrollView xmlns:android="//schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableLayout
android:id="@+id/table"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Row index 0"/>
</TableRow>
<TableRow android:id="@+id/row">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Row index 1"/>
</TableRow>
<TableRow>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Row index 2"/>
</TableRow>
<TableRow>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Row index 3"/>
</TableRow>
</TableLayout>
</ScrollView>
Button, setOnClickListener, Intent.ACTION_VIEW, startActivity Android example.
Button mIdButtonHome = (Button)findViewById(R.id.idButtonHome);
mIdButtonHome.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent browserIntent = new Intent(
Intent.ACTION_VIEW,
Uri.parse("//android.okhelp.cz/category/software/"));
startActivity(browserIntent);
}
});
Editace: 2013-12-09 10:57:01
Počet článků v kategorii: 396
Url:arraylist-collection-sort-add-java-example
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