blackbbc / Luna

Android saved instance state helper

Luna

Android instance state helper. It uses apt to generate codes.

Download

Add in your root build.gradle:

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

Add in your app/build.gradle

dependencies {
    annotationProcessor 'com.github.blackbbc.Luna:luna-processor:1.0.1'
    compile 'com.github.blackbbc.Luna:luna-annotation:1.0.1'
}

Usage

Use @State annotation to annotate variables that need to save.

public class MainActivity extends AppCompatActivity {
    @State int testInt;
    @State Integer testInteger;
    @State boolean testBoolean;
    @State float testFloat;
    @State String testString;
    @State ArrayList<Integer> integers;
    @State List<String> strings;
    @State List<Product> products;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
    }
}

Run "Build" to generate necessary helper codes. The helper codes is named by prefix Luna + ClassName. For example, the above MainActivity will generate LunaMainActivity class. Then add the following codes to use them!.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    LunaMainActivity.onRestoreInstanceState(this, savedInstanceState);
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    LunaMainActivity.onSaveInstanceState(this, outState);
}

That's all!

Support types:

1. Boxed and unboxed primitive type.

• boolean, byte, short, int, long, char, float, double
• Boolean, Byte, Short, Int, Long, Char, Float, Double

2. String
3. Parcelable
4. List<Integer>, List<String>, List<Parcelable>