Round number float - double to int - long Java example
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int nf = Math.round(5.789f);
System.out.print(nf); // 6
float f = 28.611f;
int n3 = Math.round(f);
System.out.println(n3); // 29
double d = 1234.56;
long lon = Math.round(d);
System.out.println(lon); // 1235
int diff = 90 - 40;
// float fDeleni = diff / 10; // error code
float fDeleni = (float)diff / 10.f; // ok
int nRound = Math.round(fDeleni);
// Caution:
int n2 = (int) 8.999f;
System.out.println(n2); // 8
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Show keyboard Android phone apps development example source code.
// ActivityClass.java
InputMethodManager showSoftInput;
Button hBtnKeyboardShow ;
//onCreate
showSoftInput = (InputMethodManager)this.getSystemService(Context.INPUT_METHOD_SERVICE);
hBtnKeyboardShow = (Button)findViewById(R.id.btnKeyboardShow);
hBtnKeyboardShow.setOnClickListener(myButtonListener);
// END onCreate
//button listener
private OnClickListener myButtonListener = new OnClickListener() {
public void onClick(View v) {
try {
showSoftInput.getInputMethodList();
showSoftInput.toggleSoftInput(showSoftInput.SHOW_FORCED, 0);
} catch (Exception e) {
Log.e("Keyboard show ", e.getMessage());
}
}
};
Insert into your default start up activity tag inten-filter tag with action MAIN and category LAUNCHER
AndroidManifest.xml
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="//schemas.android.com/apk/res/android"
package="com.example.blabol"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
package cz.okhelp.surfview;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
public class MainActivity extends Activity implements OnTouchListener {
OurView v;
Bitmap ball, blob;
float x, y;
Sprite sprite;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_our_view);
v = new OurView(this);
v.setOnTouchListener(this);
ball = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
x = y = 0;
setContentView(v);
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
v.pause();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
v.resume();
}
public class OurView extends SurfaceView implements Runnable {
Thread t = null;
SurfaceHolder holder;
boolean isItOK = false;
public OurView(Context context) {
super(context);
// TODO Auto-generated constructor stub
holder = getHolder();
}
public void run() {
// TODO Auto-generated method stub
while (isItOK == true) {
// perform canvas drawing
if (!holder.getSurface().isValid()) {
continue;
}
// sprite = new Sprite(OurView.this,blob);
Canvas c = holder.lockCanvas();
c.drawARGB(255, 100, 100, 10);
c.drawBitmap(ball, x, y, null);
// onDraw(c);
holder.unlockCanvasAndPost(c);
}
}
protected void onDraw(Canvas canvas) {
// sprite.onDraw(canvas);
}
public void pause() {
isItOK = false;
while (true) {
try {
t.join();
} catch (InterruptedException e) {
// TODO: handle exception
e.printStackTrace();
}
break;
}// end while
}
public void resume() {
isItOK = true;
t = new Thread(this);
t.start();
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
try {
Thread.sleep(50);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
x = event.getX();
y = event.getY();
break;
case MotionEvent.ACTION_UP:
x = event.getX();
y = event.getY();
break;
case MotionEvent.ACTION_MOVE:
x = event.getX();
y = event.getY();
break;
}// end switch
return true;
}
}
public boolean isConnected() {
try {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo().isConnectedOrConnecting();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("isConnected", e.getMessage());
Toast.makeText(getApplicationContext(), e.getMessage(),
Toast.LENGTH_LONG).show();
return false;
}
android:gravity="left|center_vertical" or android:gravity="right|center_vertical"
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="left|center_vertical"
android:paddingLeft="20dp"
android:text="My Button"
/>
Editace: 2012-07-15 14:42:42
Počet článků v kategorii: 397
Url:round-number-float-to-int-java-example
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