- Details
- Written by: Stanko Milosev
- Category: Android
- Hits: 5007
Just a few comments on my investigation about building and installing Android application.
In Linux go to root folder of your application and write something like:
./gradlew build
build means build.gradle actually, or something like ./gradlew assembleDebug, with that you will build application with debug type. Check the source in /app/build.gradle.
After building we can install application with command like:
Where:
-d Direct an adb command to the only attached USB device.
-r Reinstall an exisiting app, keeping its data.
- Details
- Written by: Stanko Milosev
- Category: Android
- Hits: 4738
For example we have view:
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" android:background="@drawable/black"/>
Notice line:
android:background="@drawable/black"
This means that I've created new file in drawable folder /app/src/main/res/drawable/black.xml which looks like:
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
<solid android:color="#ffffff" />
<stroke android:width="1dip" android:color="#000000"/>
</shape>
- Details
- Written by: Stanko Milosev
- Category: Android
- Hits: 4555
In order to have responsive UI use AsyncTask.
Here is one example.
content_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.stanko.myapplication.MainActivity"
tools:showIn="@layout/activity_main">
<EditText
android:id="@+id/myCounter"
android:layout_width="match_parent"
android:layout_height="1200px"
/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/myCounter"
android:text="Start"
android:onClick="startCounter"/>
</RelativeLayout>
MainActivity.java:
public class fillEdit extends AsyncTask<Void, String, String> {
@Override
protected String doInBackground(Void... params) {
for (Integer i=0; i<10000; i++) {
try {
Thread.currentThread().sleep(60);
} catch (InterruptedException e) {
e.printStackTrace();
}
publishProgress(i.toString());
}
return null;
}
@Override
protected void onProgressUpdate (String... result) {
EditText myCounter = (EditText) findViewById(R.id.myCounter);
myCounter.append(result[0]);
myCounter.append("\n");
}
}
public void startCounter (View view) {
new fillEdit().execute();
}
Here note:
try {
Thread.currentThread().sleep(60);
} catch (InterruptedException e) {
e.printStackTrace();
}
I needed to slow down code execution to make UI responsive, I also needed try / catch block because otherwise I would receive error:
Error:(51, 49) error: unreported exception InterruptedException; must be caught or declared to be thrown
Also, note how I am adding new line:
myCounter.append("\n");
- Details
- Written by: Stanko Milosev
- Category: Android
- Hits: 4139
<Button android:id="@+id/firstOne" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="First one" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_marginTop="53dp" /> <Button android:id="@+id/secondOne" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_below="@+id/firstOne" android:text="Second one" />
Notice line:
android:layout_below="@+id/firstOne"