File open read to StringBuilder close Java example
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BufferedReader , FileReader, StringBuilder , readLine, close Java example
Android example
Java example
Android example
String MYFILE = "my_file";
FileInputStream fis = openFileInput(MYFILE);
int c; String sText = "";
while((c=fis.read())!=-1)
{
sText += (char)c; // convert int to char
}
fis.close();
Java example
try {
BufferedReader in = new BufferedReader(new FileReader("myfile.txt"));
StringBuilder strBuilder = new StringBuilder();
String str;
while ((str = in.readLine()) != null) {
strBuilder.append(str);
}
in.close();
} catch (IOException e) {
e.toString();
}
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If project is in workspace and only not visible in project explorer using this:
Click on some project in project explorer
Menu:
File
Import project
Existing Projects into Workspace
private int[] mData = new int[2]; // fill some values into array!!
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean("myBoolean", true);
outState.putDouble("myDouble", 2.7);
outState.putInt("myInt", 5);
outState.putString("myString", "Heloo girls!");
int[] data = new int[mData.length];
for (int i = 0; i < data.length; i++) {
data[i] = mData[i];
}
outState.putIntArray("myArray", data);
}
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
boolean myBoolean = savedInstanceState.getBoolean("myBoolean", false); // false basic value
double myDouble = savedInstanceState.getDouble("myDouble", 1.5); // 1.5 basic value
int myInt = savedInstanceState.getInt("myInt", 10);
String myString = savedInstanceState.getString("myString", "Hello boys!");
int[] data = savedInstanceState.getIntArray("myArray");
if (data != null && data.length == mData.length) {
for (int i = 0; i < data.length; i++) {
mData[i] = data[i];
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
boolean myBoolean = savedInstanceState != null ? savedInstanceState.getBoolean("myBoolean", false) : true;
// etc. .......
}
If on Android emulator home button pressed.
Diagram of Activity lifecycle if button HOME pressed
// button home presssed
19:37:06.727: INFO/ActivityManager(60): Starting:
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME]
flg=0x10200000 cmp=com.android.launcher/com.android.launcher2.Launcher } from pid 60
19:37:06.807: INFO/onSaveInstanceState(339): onSaveInstanceState()
19:37:06.848: INFO/onPause(339): onPause()
19:37:07.968: INFO/onStop(339): onStop()
Diagram of Activity lifecycle if button HOME pressed
No resource found that matches the given name - error examples.
Exist resource file?
Is code written correctly?
Exist resource file?
Is code written correctly?
// No resource found that matches the given name (at id with value @id/myButton).
android:id="@id/myButton" // invalid id notation
android:id="@+id/myButton" // correct
// No resource found that matches the given name
// (at icon with value @drawable/icons).
// exist file icons in res/drawable folder?
<application android:icon="@drawable/icons"
//No resource found that matches the given name
//(at theme with value @style/MyThem).
<activity android:name=".Main"
android:label="@string/app_name"
android:theme="@style/MyThem">
// Exist style MyThem in styles.xml ? No only MyTheme
<style name="MyTheme" parent="android:Theme">
<item name="android:windowTitleSize">50px</item>
</style>
// exist file my_background in folder drawable ?
android:background="@drawable/my_background" //
// no resource found that matches the given name(at "label" with value "@string/app_name")
// have you the string resource defined in res/values/strings.xml ?
<string name="app_name">"My App"</string>
Editace: 2011-10-03 12:34:27
Počet článků v kategorii: 397
Url:file-open-read-to-stringbuilder-close-java-example
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