Android(SDK 1.5) Button 的单击事件的三种响应方法

Android(SDK 1.5) Button 的单击事件的三种响应方法：

http://blog.csdn.net/hopease/article/details/7293244

 

第一种：个人认为写法不好，不容易看懂。

package leo.zheng.ButtonClick;

import android.app.Activity;
import android.os.Bundle;

import android.graphics.Color;
import android.widget.Button;

import android.widget.TextView;
import android.view.View;
import android.view.View.OnClickListener;

import android.util.Log;

public class ButtonClick extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final TextView Text = (TextView)findViewById(R.id.ColorView);
        final Button redButton = (Button)findViewById(R.id.Button01);
        final Button greenButton = (Button)findViewById(R.id.Button02);

        redButton.setOnClickListener(
            new OnClickListener()
            {
                public void onClick(View v)
                {
                    Text.setBackgroundColor(Color.RED);
                    Log.v("Button click", "red");
                }
            }
        );

        greenButton.setOnClickListener(
            new OnClickListener()
            {
                public void onClick(View v)
                {
                    Text.setBackgroundColor(Color.GREEN);
                    Log.v("Button click","green");
                }
            }
        );
    }
}

package leo.zheng.ButtonClick;

import android.app.Activity;
import android.os.Bundle;

import android.graphics.Color;
import android.widget.Button;

import android.widget.TextView;
import android.view.View;
import android.view.View.OnClickListener;

import android.util.Log;

public class ButtonClick extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        final TextView Text = (TextView)findViewById(R.id.ColorView);
        final Button redButton = (Button)findViewById(R.id.Button01);
        final Button greenButton = (Button)findViewById(R.id.Button02);
        
        redButton.setOnClickListener(
        	new OnClickListener()
        	{
        		public void onClick(View v)
        		{
        			Text.setBackgroundColor(Color.RED);
        			Log.v("Button click", "red");
        		}
        	}
        );
        
        greenButton.setOnClickListener(
        	new OnClickListener()
        	{
        		public void onClick(View v)
        		{
        			Text.setBackgroundColor(Color.GREEN);
        			Log.v("Button click","green");
        		}
        	}
        );
    }
}

 

第二种：Activity implements OnClickListener

package leo.zheng.ButtonClick2;

import android.app.Activity;
import android.os.Bundle;

import android.view.View;
import android.view.View.OnClickListener;

import android.util.Log;

import android.widget.TextView;
import android.widget.Button;

public class ButtonClick2 extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    private TextView textChange;
    private Button button1;
    private Button button2;

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

        textChange = (TextView)findViewById(R.id.TextView01);
        button1 = (Button)findViewById(R.id.Button01);
        button1.setOnClickListener(this);
        button2 = (Button)findViewById(R.id.Button02);
        button2.setOnClickListener(this);
    }

    public void onClick(View v)
    {
        Log.v("Click", "Button id = " + v.getId());
        switch(v.getId())
        {
        case R.id.Button01:
            textChange.setText("Ok");
            break;
        case R.id.Button02:
            textChange.setText("Cancal");
            break;
        default:
            break;
        }
    }
}

package leo.zheng.ButtonClick2;

import android.app.Activity;
import android.os.Bundle;

import android.view.View;
import android.view.View.OnClickListener;

import android.util.Log;

import android.widget.TextView;
import android.widget.Button;

public class ButtonClick2 extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
	private TextView textChange;
	private Button button1;
	private Button button2;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        textChange = (TextView)findViewById(R.id.TextView01);
    	button1 = (Button)findViewById(R.id.Button01);
    	button1.setOnClickListener(this);
    	button2 = (Button)findViewById(R.id.Button02);
    	button2.setOnClickListener(this);
    }
    
    public void onClick(View v)
    {
    	Log.v("Click", "Button id = " + v.getId());
    	switch(v.getId())
    	{
    	case R.id.Button01:
    		textChange.setText("Ok");
    		break;
    	case R.id.Button02:
    		textChange.setText("Cancal");
    		break;
    	default:
    		break;
    	}
    }
}

 

第三种：个人比较推荐。

package leo.zheng.ButtonClick3;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;

import android.util.Log;

import android.widget.Button;
import android.widget.TextView;

import android.view.View;
import android.view.View.OnClickListener;

public class ButtonClick3 extends Activity {
    /** Called when the activity is first created. */
    private Button button1;
    private Button button2;
    private TextView colorShow;

    private button1_OnClickListener listener1 = new button1_OnClickListener();
    private button2_OnClickListener listener2 = new button2_OnClickListener();

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

        button1 = (Button) findViewById(R.id.Button01);
        button2 = (Button) findViewById(R.id.Button02);
        colorShow = (TextView) findViewById(R.id.TextView01);

        button1.setOnClickListener(listener1);
        button2.setOnClickListener(listener2);
    }

    class button1_OnClickListener implements OnClickListener
    {
        public void onClick(View v)
        {
            Log.v("Click", "Button GREEN");
            colorShow.setBackgroundColor(Color.GREEN);
        }
    }

    class button2_OnClickListener implements OnClickListener
    {
        public void onClick(View v)
        {
            Log.v("Click", "Button BLUE");
            colorShow.setBackgroundColor(Color.BLUE);
        }
    }
}