Android Interface 接口

Android 接口的简单例子。

1. 程序结构：

2. 代码：

MainActivity.java

package com.interfacetest;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

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

    MyView myView = (MyView) findViewById(R.id.myView);
    myView.setMyCallback(new MyCallback() {

      @Override
      public void run(String content) {
        // TODO Auto-generated method stub
        System.out.println("=== content:" + content + " ===");
      }
    });

  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

}

Mycallback.java

package com.interfacetest;

public interface MyCallback {
  public void run(String content);
}

MyView.java

package com.interfacetest;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.TextView;

public class MyView extends TextView {

  private MyCallback myCallback;

  public MyView(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
    new myThread().start();
  }

  /** 调用这个函数来初始化接口，就像Button的setOnClickListener */
  public void setMyCallback(MyCallback myCallback) {
    this.myCallback = myCallback;
  }

  /** 对调用接口函数操作的封装 */
  public void callMycallback(String content) {
    myCallback.run(content);
  }

  class myThread extends Thread {
    private int count = -1;

    @Override
    public void run() {
      // TODO Auto-generated method stub
      super.run();

      while (true) {

        try {
          sleep(1000);
        } catch (InterruptedException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }

        count++;
        /** 调用接口函数 */
        callMycallback(count + "");
      }
    }

  }

}