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- Written by: Stanko Milosev
- Category: Android
- Hits: 4236
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: 4031
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: 3903
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: 3552
<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"