├── res
    ├── values
    │   └── strings.xml
    └── layout
    │   ├── length_picker.xml
    │   └── main.xml
├── project.properties
├── AndroidManifest.xml
├── proguard-project.txt
└── src
    └── com
        └── sqisland
            └── android
                └── length_picker
                    ├── MainActivity.java
                    └── LengthPicker.java


/res/values/strings.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <resources>
 3 |   <string name="app_name">Length Picker</string>
 4 | 
 5 |   <string name="plus">+</string>
 6 |   <string name="minus">-</string>
 7 | 
 8 |   <string name="width">Width</string>
 9 |   <string name="height">Height</string>
10 |   <string name="area">Area</string>
11 |   <string name="compute">Compute</string>
12 |   <string name="area_format">%1$d sq in</string>
13 | </resources>


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/project.properties:
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 1 | # This file is automatically generated by Android Tools.
 2 | # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
 3 | #
 4 | # This file must be checked in Version Control Systems.
 5 | #
 6 | # To customize properties used by the Ant build system edit
 7 | # "ant.properties", and override values to adapt the script to your
 8 | # project structure.
 9 | #
10 | # To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
11 | #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
12 | 
13 | # Project target.
14 | target=android-15
15 | 


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/AndroidManifest.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3 |   package="com.sqisland.android.length_picker"
 4 |   android:versionCode="1"
 5 |   android:versionName="1.0" >
 6 | 
 7 |   <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="12" />
 8 | 
 9 |   <application
10 |     android:label="@string/app_name" >
11 |     <activity
12 |       android:name=".MainActivity"
13 |       android:label="@string/app_name" >
14 |       <intent-filter>
15 |         <action android:name="android.intent.action.MAIN" />
16 |         <category android:name="android.intent.category.LAUNCHER" />
17 |       </intent-filter>
18 |     </activity>
19 |   </application>
20 | </manifest>


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/res/layout/length_picker.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <merge xmlns:android="http://schemas.android.com/apk/res/android"
 3 |   android:layout_width="match_parent"
 4 |   android:layout_height="match_parent"
 5 |   android:orientation="horizontal" >
 6 |   <Button
 7 |     android:id="@+id/minus_button"
 8 |     android:layout_width="wrap_content"
 9 |     android:layout_height="wrap_content"
10 |     android:text="@string/minus" />
11 |   <TextView
12 |     android:id="@+id/text"
13 |     android:layout_width="50dp"
14 |     android:layout_height="wrap_content"
15 |     android:gravity="center" />
16 |   <Button
17 |     android:id="@+id/plus_button"
18 |     android:layout_width="wrap_content"
19 |     android:layout_height="wrap_content"
20 |     android:text="@string/plus" />
21 | </merge>


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/proguard-project.txt:
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 1 | # To enable ProGuard in your project, edit project.properties
 2 | # to define the proguard.config property as described in that file.
 3 | #
 4 | # Add project specific ProGuard rules here.
 5 | # By default, the flags in this file are appended to flags specified
 6 | # in ${sdk.dir}/tools/proguard/proguard-android.txt
 7 | # You can edit the include path and order by changing the ProGuard
 8 | # include property in project.properties.
 9 | #
10 | # For more details, see
11 | #   http://developer.android.com/guide/developing/tools/proguard.html
12 | 
13 | # Add any project specific keep options here:
14 | 
15 | # If your project uses WebView with JS, uncomment the following
16 | # and specify the fully qualified class name to the JavaScript interface
17 | # class:
18 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
19 | #   public *;
20 | #}
21 | 


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/src/com/sqisland/android/length_picker/MainActivity.java:
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 1 | package com.sqisland.android.length_picker;
 2 | 
 3 | import android.app.Activity;
 4 | import android.os.Bundle;
 5 | import android.view.View;
 6 | import android.widget.TextView;
 7 | 
 8 | public class MainActivity extends Activity {
 9 |   private LengthPicker mWidth;
10 |   private LengthPicker mHeight;
11 |   private TextView mArea;
12 | 
13 |   @Override
14 |   public void onCreate(Bundle savedInstanceState) {
15 |     super.onCreate(savedInstanceState);
16 |     setContentView(R.layout.main);
17 | 
18 |     mWidth = (LengthPicker) findViewById(R.id.width);
19 |     mHeight = (LengthPicker) findViewById(R.id.height);
20 |     mArea = (TextView) findViewById(R.id.area);
21 |   }
22 | 
23 |   @Override
24 |   public void onResume() {
25 |     super.onResume();
26 |     updateArea(null);
27 |   }
28 | 
29 |   public void updateArea(View v) {
30 |     int area = mWidth.getNumInches() * mHeight.getNumInches();
31 |     mArea.setText(getString(R.string.area_format, area));
32 |   }
33 | }


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/res/layout/main.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 |   android:layout_width="match_parent"
 4 |   android:layout_height="wrap_content" >
 5 |   <TableRow>
 6 |     <TextView
 7 |       android:layout_width="wrap_content"
 8 |       android:layout_height="match_parent"
 9 |       android:gravity="center"
10 |       android:text="@string/width" />
11 |     <com.sqisland.android.length_picker.LengthPicker
12 |       android:id="@+id/width"
13 |       android:layout_width="wrap_content"
14 |       android:layout_height="wrap_content" />
15 |   </TableRow>
16 |   <TableRow>
17 |     <TextView
18 |       android:layout_width="wrap_content"
19 |       android:layout_height="match_parent"
20 |       android:gravity="center"
21 |       android:text="@string/height" />
22 |     <com.sqisland.android.length_picker.LengthPicker
23 |       android:id="@+id/height"
24 |       android:layout_width="wrap_content"
25 |       android:layout_height="wrap_content" />
26 |   </TableRow>
27 |   <TableRow>
28 |     <TextView
29 |       android:layout_width="wrap_content"
30 |       android:layout_height="wrap_content"
31 |       android:text="@string/area" />
32 |     <TextView
33 |       android:id="@+id/area"
34 |       android:layout_width="match_parent"
35 |       android:layout_height="wrap_content"
36 |       android:gravity="center" />
37 |     <Button
38 |       android:layout_width="wrap_content"
39 |       android:layout_height="wrap_content"
40 |       android:text="@string/compute"
41 |       android:onClick="updateArea" />
42 |   </TableRow>
43 | </TableLayout>


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/src/com/sqisland/android/length_picker/LengthPicker.java:
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  1 | package com.sqisland.android.length_picker;
  2 | 
  3 | import android.content.Context;
  4 | import android.os.Bundle;
  5 | import android.os.Parcelable;
  6 | import android.util.AttributeSet;
  7 | import android.view.LayoutInflater;
  8 | import android.view.View;
  9 | import android.widget.LinearLayout;
 10 | import android.widget.TextView;
 11 | 
 12 | public class LengthPicker extends LinearLayout implements View.OnClickListener {
 13 |   private static final String SUPER_STATE = "superState";
 14 |   private static final String NUM_INCHES = "numInches";
 15 | 
 16 |   private TextView mTextView;
 17 |   private View mMinusButton;
 18 | 
 19 |   private View mPlusButton;
 20 |   private int mNumInches = 0;
 21 | 
 22 |   public LengthPicker(Context context) {
 23 |     super(context);
 24 |     init();
 25 |   }
 26 | 
 27 |   public LengthPicker(Context context, AttributeSet attrs) {
 28 |     super(context, attrs);
 29 |     init();
 30 |   }
 31 | 
 32 |   public LengthPicker(Context context, AttributeSet attrs, int defStyle) {
 33 |     super(context, attrs, defStyle);
 34 |     init();
 35 |   }
 36 | 
 37 |   private void init() {
 38 |     LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(
 39 |         Context.LAYOUT_INFLATER_SERVICE);
 40 |     inflater.inflate(R.layout.length_picker, this);
 41 | 
 42 |     mPlusButton = findViewById(R.id.plus_button);
 43 |     mTextView = (TextView) findViewById(R.id.text);
 44 |     mMinusButton = findViewById(R.id.minus_button);
 45 | 
 46 |     updateControls();
 47 | 
 48 |     mPlusButton.setOnClickListener(this);
 49 |     mMinusButton.setOnClickListener(this);
 50 |   }
 51 | 
 52 |   private void updateControls() {
 53 |     int feet = mNumInches / 12;
 54 |     int inches = mNumInches % 12;
 55 | 
 56 |     String text = String.format("%d' %d\"", feet, inches);
 57 |     if (feet == 0) {
 58 |       text = String.format("%d\"", inches);
 59 |     } else {
 60 |       if (inches == 0) {
 61 |         text = String.format("%d'", feet);
 62 |       }
 63 |     }
 64 |     mTextView.setText(text);
 65 | 
 66 |     mMinusButton.setEnabled(mNumInches > 0);
 67 |   }
 68 | 
 69 |   public int getNumInches() {
 70 |     return mNumInches;
 71 |   }
 72 | 
 73 |   @Override
 74 |   public Parcelable onSaveInstanceState() {
 75 |     Bundle bundle = new Bundle();
 76 |     bundle.putParcelable(SUPER_STATE, super.onSaveInstanceState());
 77 |     bundle.putInt(NUM_INCHES, mNumInches);
 78 |     return bundle;
 79 | 
 80 |   }
 81 | 
 82 |   @Override
 83 |   public void onRestoreInstanceState(Parcelable state) {
 84 |     if (state instanceof Bundle) {
 85 |       Bundle bundle = (Bundle) state;
 86 |       mNumInches = bundle.getInt(NUM_INCHES);
 87 |       super.onRestoreInstanceState(bundle.getParcelable(SUPER_STATE));
 88 |     } else {
 89 |       super.onRestoreInstanceState(state);
 90 |     }
 91 |     updateControls();
 92 |   }
 93 | 
 94 |   @Override
 95 |   public void onClick(View v) {
 96 |     switch (v.getId()) {
 97 |     case R.id.plus_button:
 98 |       mNumInches++;
 99 |       updateControls();
100 |       break;
101 |     case R.id.minus_button:
102 |       if (mNumInches > 0) {
103 |         mNumInches--;
104 |         updateControls();
105 |       }
106 |       break;
107 |     }
108 |   }
109 | }
110 | 


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