Write new file or append text Java Android example
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BufferedWriter, FileWriter, write, close MODE_APPEND Java and Android example
Write to file Android example
Write to file Java example
Write to file Android example
try {
String MYFILE = "my_file";
String strText = "My text";
// MODE_APPEND, MODE_WORLD_READABLE, MODE_WORLD_WRITEABLE
// create new file or rewrite existing
FileOutputStream fos = openFileOutput(MYFILE, getApplicationContext().MODE_PRIVATE);
// append to file
FileOutputStream fos = openFileOutput(MYFILE, getApplicationContext().MODE_APPEND);
fos.write(strText.getBytes());
fos.close();
} catch (IOException e) {
e.toString();
}
Write to file Java example
try {
// new file
BufferedWriter out = new BufferedWriter(
new FileWriter("outfilename"));
// append text
BufferedWriter out = new BufferedWriter(new FileWriter("outfilename", true));
out.write("some text");
out.close();
} catch (IOException e) {
e.toString();
}
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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>
Terms Screen size, density, density independent pixel, resolution as a picture - pictogram.
Test your knowledge
Q: How to find out the phone screen size?
A: (By length of display diagonale in inch - Not to measure a diagonal of device!!!)
Q: What resolution has 720 x 1280 display?
A: (921600 pixels)
Q: What does it mean "240 dpi" screen density?
A: (Display have density 240 x 240 dots - "Tri-color LED etc." - per every physical (real) square inch. If you have icon 240x240 pixels, this will just occupy an area of one square inch on the display.)
Q: Phone have screen density 240 dpi. Image for 160 dpi screen density have size 128x 128 pixels. What will be the size of the image for 240 dpi screen density?
A: (Calculate the virtual pixels size. 128 * (240/160) = 192. You have to resize image to new size 192 x 192 physical pixels and put into folder drawable-hdpi (high) ~240dpi for phone with screen density 240 dpi. ) or use density independend pixels 128dp x 128dp.
Test your knowledge
Q: How to find out the phone screen size?
A: (By length of display diagonale in inch - Not to measure a diagonal of device!!!)
Q: What resolution has 720 x 1280 display?
A: (921600 pixels)
Q: What does it mean "240 dpi" screen density?
A: (Display have density 240 x 240 dots - "Tri-color LED etc." - per every physical (real) square inch. If you have icon 240x240 pixels, this will just occupy an area of one square inch on the display.)
Q: Phone have screen density 240 dpi. Image for 160 dpi screen density have size 128x 128 pixels. What will be the size of the image for 240 dpi screen density?
A: (Calculate the virtual pixels size. 128 * (240/160) = 192. You have to resize image to new size 192 x 192 physical pixels and put into folder drawable-hdpi (high) ~240dpi for phone with screen density 240 dpi. ) or use density independend pixels 128dp x 128dp.
(Our software)
| 1 | Samsung Galaxy S2 | 13.8% (1,232) |
| 2 | Samsung Galaxy S | 8.5% (762) |
| 3 | Samsung Galaxy Tab | 7.4% (659) |
| 4 | Samsung Galaxy Mini | 5.4% (483) |
| 5 | Samsung Galaxy S | 4.0% (356) |
| 6 | HTC Desire HD | 3.8% (341) |
| 7 | Samsung Galaxy Ace | 3.8% (339) |
| 8 | HTC Wildfire | 3.2% (286) |
| 9 | Samsung Galaxy Fit | 3.1% (274) |
| 10 | SEMC Xperia X10 | 2.1% (190) |
How include layout defined in other xml file into another xml file example:
res/layout/my_layout.xml into
main.xml
res/layout/my_layout.xml into
main.xml
<include layout="@layout/my_layout" android:id="@+id/idMyLayout" />
// in strings.xml
<string name="myStringWithTags"><![CDATA[<b>some text..</b> other tags ...]]></string>
<string name="myStringWithPattern"><![CDATA[<b>%s</b> other tags ...]]></string>
// in Activity.class
String sHtmlText = this.getApplicationContext().getString(R.string.myStringTags);
sHtmlText = this.getApplicationContext().getString(R.string.myStringWithPattern,"replace %s with this text");
Editace: 2011-10-03 11:09:06
Počet článků v kategorii: 397
Url:write-file-java-android-example
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