IshikotaKnife

Simple View injection framework for learning annotation processing, javapoet, compile-testing

Usage

First, you put @IshikotaBind annotation on the field where you want to inject View.

public class ExampleActivity extends AppCompatActivity {
    @IshikotaBind(R.id.text)
    public TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      IshikotaKnife.bind(this);
      mTextView.setText("We injected !!");
    }
}

In compile time, below source code which suffixed with $$IshikotaViewBinder is created.

public class ExampleActivity$$IshikotaViewBinder {
  public void bind(jp.ikota.ishikotaknifeuser.ExampleActivity target) {
    ((ExampleActivity)target).mTextView = (android.widget.TextView)target.findViewById(2131492944);
  }
}

Finally, IshikotaKnife.bind method invokes ExampleActivity$$IshikotaViewBinder.bind method and inject views.
So now, we can access our views without NullPointerException!!

public class IshikotaKnife {
  public static void bind(Activity target) {
    final Class clazz = Class.forName(target.getClass().getCanonicalName() + "$$IshikotaViewBinder");
    final Method bind = clazz.getMethod("bind", target.getClass());
    bind.invoke(clazz.newInstance(), target);
  }
}

Gradle

apply plugin: 'com.android.application'

buildscript {
  repositories {
    jcenter()
  }
  dependencies {
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
  }
}

apply plugin: 'com.neenbedankt.android-apt'

android {
    //...
}

dependencies {
    //...
    compile 'jp.ikota:ishikotaknife:0.0.1'
    compile 'jp.ikota:ishikotaknife-annotations:0.0.1'
    apt 'jp.ikota:ishikotaknife-compiler:0.0.1'
}

License

Copyright 2015 Kota Ishimoto

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.