Use Lambda expressions in Android Studio, androidlambda

Use Lambda expressions in Android Studio, androidlambda

Lambda expressions are a function-based derivation language supported by JDK 8, which can greatly reduce the redundant code of anonymous internal classes. In Android, you can use it extensively in scenarios such as setting listeners and setting asynchronous callbacks.

Currently, Android development has gradually migrated from the Eclipse ADT to Android Studio. However, the current version of Android Studio does not directly support Lambda expressions and requires plug-ins. Of course, JDK 8 or a later version is required ).

1. Introduce the plugin Lambda plug-in:

Add

apply plugin: 'me.tatarka.retrolambda'

2. Set the compilation option (or you may not write it)

Add the following code to the Project's build. gradle android node:

compileOptions {        sourceCompatibility JavaVersion.VERSION_1_8        targetCompatibility JavaVersion.VERSION_1_8    }

3. Introduce the ingress Lambda class path and add the following code to the buildscript> dependencies node in Module: app build. gradle.

classpath 'me.tatarka:gradle-retrolambda:3.2.0'

4. build. gradle

5. Write the test code as follows:

    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = (TextView)findViewById(R.id.text);        textView.setOnClickListener( v -> Toast.makeText(getApplicationContext(), "Lambda", Toast.LENGTH_LONG).show());    }

6. Run the command to check whether it is normal.