Simple app using picture
This app demonstrates picture display and output, click on picture:
app/res/drawable - pictures
There are two images moved into here. One is called star.png and is a red filled-in star. The other is called empty.png and is an empty star. Both are the same size and are 400x400 pixels.
app/res/mipmap/ic_launcher.png/ - icon for launching app
An image called ic_launcher.png is moved into all 5 versions of ic_launcher.png. It involves overwriting what's there already. (In fact I just used a copy of star.png but with a black background rather than a white one.)
app/res/values/strings.xml - strings
<![CDATA[
<resources>
<string name="app_name">Picture</string>
<string name="clickStar">"Click on star"</string>
<string name="descStar">"Star"</string>
</resources>
]]>
app/res/layout/activity_main.xml - screen format
<![CDATA[
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:id="@+id/instr"
android:text="@string/clickStar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<ImageView
android:id="@+id/starPix"
android:src="@drawable/star"
android:onClick="changePix"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/descStar"
android:layout_below="@id/instr"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
]]>
app/java/com.(the project name)/MainActivity - main code for app
<![CDATA[
package com.edkins.picture;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
static int toggle = 0;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void changePix(View view) {
ImageView star = (ImageView) findViewById(R.id.starPix);
if (toggle == 0) {star.setImageResource(R.drawable.empty);}
else {star.setImageResource(R.drawable.star);}
toggle = 1 - toggle;
}
}
]]>
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© Jo Edkins 2016