Hi,
I have written a filewriter for my
android application. It is to function on a Galaxy Tab, so my minSdkVersion has to be at least 4, so it will fill the screen. I originally started out with SdkVersion = 2 and at that point my filewriter worked perfectly. Changing the SdkVersion to 4 introduced the problem. My filewriter doesn't work anymore! The application runs fine, but a file doesn't get created.
My .java file looks like this:
public class HelloAndroid extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView tv = new TextView(this);
tv.setText("Hello,
Android");
setContentView(R.layout.main);
//definerer en knap kaldet button1 og sætter en listener på denne.
Button button1 = (Button)findViewById(R.id.btnClickMe);
button1.setOnClickListener(btnListener);
//definerer en knap kaldet button2 og sætter en listener på denne.
Button button2 = (Button)findViewById(R.id.btnClickMe2);
button2.setOnClickListener(btnListener2);
}
//en variabel af typen 'long' deklæres og kaldes tid1.
public long time1;
private OnClickListener btnListener = new OnClickListener()
{
public void onClick(View v)
{
//Når der klikkes på button1 gemmes et tal i variablen tid1.
time1 = System.currentTimeMillis();
}
};
//en variabel af typen 'long' deklæres og kaldes tid2.
public long time2;
// en variabel af typen 'string' deklæres og kaldes tid:
public String string1 = "time:";
private OnClickListener btnListener2 = new OnClickListener()
{
public void onClick(View v)
{
//Når der klikkes på button2 gemmes et tal i variablen tid2.
time2 = System.currentTimeMillis();
// Herefter oprettes en fil kaldet "file.txt".
try{
File file = new File(Environment.getExternalStorageDirectory(), "file.txt");
file.createNewFile();
BufferedWriter writer = new BufferedWriter(new FileWriter(file,true));
//string1 og tid2-tid1 skrives til filen. tid2-tid1 giver den tid der går fra der er trykket på den ene knap til den anden i millisekunder.
writer.write(string1 + "\t" + (time2-time1));
writer.newLine();
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
And my manifest.xml looks like this:
<?xml version="1.0" encoding="utf-8"?>
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".HelloAndroid"
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>
Why does my filewriter not work with minSdkVersion 2? Do i have to make a new filewriter? or what to do?
Sorry for the messy code, i'
m quite new to programming :)
