Simple app using picture
This app demonstrates picture display and output, click on picture:
app/res/drawable - (pictures) - nothing in here
app/res/mipmap/ic_launcher.png/ - (icon for launching app) - don't change this
app/res/values/strings.xml - strings
<![CDATA[
<resources>
<string name="app_name">Text</string>
<string name="convert">"Convert"</string>
<string name="clear">"Clear"</string>
<string name="init">" ? "</string>
<string name="ozName">"oz"</string>
<string name="equalSymbol">" = "</string>
<string name="gmName">"gm"</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">
<!-- ounces -->
<EditText
android:id="@+id/ozVal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:onClick="doClear"
android:hint="@string/init"
/>
<TextView
android:id="@+id/ozDesc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="@string/ozName"
android:layout_alignBaseline="@id/ozVal"
android:layout_toRightOf="@id/ozVal"
android:layout_toEndOf="@id/ozVal"
/>
<!-- equals -->
<TextView
android:id="@+id/eq"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:text="@string/equalSymbol"
android:layout_alignBaseline="@id/ozDesc"
android:layout_toRightOf="@id/ozDesc"
android:layout_toEndOf="@id/ozDesc"
/>
<!-- grams -->
<TextView
android:id="@+id/gmVal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/gmName"
android:layout_alignBaseline="@id/eq"
android:layout_toRightOf="@id/eq"
android:layout_toEndOf="@id/eq"
/>
<!-- buttone - convert and clear -->
<Button
android:id="@+id/convertButton"
android:text="@string/convert"
android:onClick="doCalc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/ozVal"
/>
<Button
android:id="@+id/clearButton"
android:text="@string/clear"
android:onClick="doClear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@id/convertButton"
android:layout_toRightOf="@id/convertButton"
android:layout_toEndOf="@id/convertButton"
/>
</RelativeLayout>
]]>
app/java/com.(the project name)/MainActivity - main code for app
<![CDATA[
package com.edkins.text;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
double ozAmt = 0.0;
double gmAmt = 0.0;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// handle input
public void doCalc(View view) {
EditText oz = (EditText) findViewById(R.id.ozVal);
TextView gm = (TextView) findViewById(R.id.gmVal);
ozAmt = convNum(oz.getText().toString());
gmAmt = Math.round(ozAmt * 28.35);
String gmOut = format(gmAmt)+getString(R.string.gmName);
gm.setText(gmOut);
}
// clear fields
public void doClear(View view) {
EditText oz = (EditText) findViewById(R.id.ozVal);
TextView gm = (TextView) findViewById(R.id.gmVal);
oz.setText("");
gm.setText(getString(R.string.gmName));
}
// trap non-numerics in input string
private double convNum(String inp) {
try{return Double.parseDouble(inp);}
catch(Exception e){return 0;}
}
// format fields for output
private String format(double fld) {
fld = Math.round(fld);
return String.format("%4.0f", fld);
}
}
]]>
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© Jo Edkins 2016