How to programmatically set the button style - Android
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How set rounded corners and own styles ActivityMy.java
\res\drawable\back_button_answer.xml
Button btn.setBackgroundResource(R.drawable.back_button_answer);
\res\drawable\back_button_answer.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="//schemas.android.com/apk/res/android" android:shape="rectangle" >
<corners android:radius="10dip" />
<!-- background -->
<gradient
android:startColor="#D6D7D6"
android:centerColor="#E2E2E2"
android:centerY="0.75"
android:endColor="#D6D7D6"
android:angle="270"
/>
<stroke android:width="2dip" android:color="#fff"/>
</shape>
397LW NO topic_id
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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;
}
1.) check your xml files in res/layout folder if contain errors or warnings, repair this
2.) try comment import R in Activity file
// import com.mysite.packagename.R;
3.) every clean and rebuild project
2.) try comment import R in Activity file
// import com.mysite.packagename.R;
3.) every clean and rebuild project
android:background="@android:color/transparent"
<LinearLayout
android:baselineAligned="false"
android:background="@android:color/transparent"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<LinearLayout>
////////////////////////////
LinearLayout mLinearLayout1 = (LinearLayout)findViewById(R.id.linearLayout1);
mLinearLayout1.setBackgroundColor(Color.TRANSPARENT);
Dialog Yes No sample code
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to exit application?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
MyActivity.this.finish(); //Close this Activity for example: MyActivity.java
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// some code if you want
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
Get display, screen resolution - dimension Android phone development example source code.
Example:
HTC Desire HD
11 (4.3) Diagonal cm (in)
480×800 Resolution
85 (217) ppcm (PPI - Pixels per inch)
480 / 217 = 2.21 inch
800 / 217 = 3.69 inch
Math.sqrt( 2.21*2.21 + 3.69 * 3.69) = 4.3 inch - diagonal
//en.wikipedia.org/wiki/Pixels_per_inch
//en.wikipedia.org/wiki/Dots_per_inch
Typical screen widths:
320dp: a typical phone screen (240x320 ldpi, 320x480 mdpi, 480x800 hdpi, etc).
480dp: a tweener tablet like the Streak (480x800 mdpi).
600dp: a 7” tablet (600x1024 mdpi).
720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).
Emulator skins in the Android SDK
//developer.android.com/guide/practices/screens_support.html
Display display = getWindowManager().getDefaultDisplay();
int nWidth = display.getWidth();
int nHeight = display.getHeight();
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
//get density per inch for example: 120 , 160 , 240
mXDpi = metrics.xdpi; // 160 The exact physical pixels per inch of the screen in the X dimension.
mYDpi = metrics.ydpi;
// density
int nDensity = metrics.densityDpi; // 160 screen density expressed as dots-per-inch
float mMetersToPixelsX = mXDpi / 0.0254f; // 1 inch == 0.0254 metre
float mMetersToPixelsY = mYDpi / 0.0254f;
// Resolution
// The total number of physical pixels on a screen.
int wPix = metrics.widthPixels; // 320 The absolute width of the display in pixels.
int hPix = metrics.heightPixels; // 480 The absolute height of the display in pixels.
int nWidthDisplay = (wPix < hPix)? wPix : hPix;
float nWidthScreenInInch = wPix / mXDpi; //320 / 160 == 2.0 in inch.
float nHeightScreenInInch = hPix / mYDpi; //480 / 160 == 3.0 in inch.
// for example:
// density 120 per inch
//width 320 pix / 120 dpi == width 2.66 inch
//height 480 pix / 120 dpi == height 4.0 inch
// density 240 per inch
//width 320 pix / 240 dpi == width 1.33 inch
//height 480 pix / 240 dpi == height 2.0 inch
Example:
HTC Desire HD
11 (4.3) Diagonal cm (in)
480×800 Resolution
85 (217) ppcm (PPI - Pixels per inch)
480 / 217 = 2.21 inch
800 / 217 = 3.69 inch
Math.sqrt( 2.21*2.21 + 3.69 * 3.69) = 4.3 inch - diagonal
//en.wikipedia.org/wiki/Pixels_per_inch
//en.wikipedia.org/wiki/Dots_per_inch
Typical screen widths:
320dp: a typical phone screen (240x320 ldpi, 320x480 mdpi, 480x800 hdpi, etc).
480dp: a tweener tablet like the Streak (480x800 mdpi).
600dp: a 7” tablet (600x1024 mdpi).
720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).
Emulator skins in the Android SDK
//developer.android.com/guide/practices/screens_support.html
|
|
|
|
|
---|---|---|---|---|
Small screen |
QVGA (240x320) | 480x640 | ||
Normal screen |
WQVGA400 (240x400)
WQVGA432 (240x432) |
HVGA (320x480) | WVGA800 (480x800)
WVGA854 (480x854) 600x1024 |
640x960 |
Large screen |
WVGA800** (480x800)
WVGA854** (480x854) |
WVGA800* (480x800)
WVGA854* (480x854) 600x1024 |
||
Extra Large screen |
1024x600 | WXGA (1280x800)† 1024x768 1280x768 |
1536x1152 1920x1152 1920x1200 |
2048x1536 2560x1536 2560x1600 |
* To emulate this configuration, specify a
custom density of 160 when creating an AVD that uses a WVGA800 or WVGA854 skin. ** To emulate this configuration, specify a custom density of 120 when creating an AVD that uses a WVGA800 or WVGA854 skin. † This skin is available with the Android 3.0 platform |
Editace: 2012-07-25 20:54:27
Počet článků v kategorii: 397
Url:how-to-programmatically-set-the-button-style-android
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