安卓初学——界面按钮响应

女爷i 2023-01-22 11:47 35阅读 0赞

### 安卓学习——采用onClickListener监听器，界面按钮响应 ###

*  （一）定义监听，绑定组件
 *  （二）通过匿名内部类，把组件和事件绑定
 *  （三）采用view 对象调用onClick
 *  (四)在当前Activity实现监听接口

# （一）定义监听，绑定组件 #

**自定义一个类，用来筛选监听的指令**

class MyClickedHandle implements View.OnClickListener
    {
        
    	public void onClick(View v)
    	{
        
    		switch(v.getId())
        	{
        
        	case R.id.button1:
        		System.out.println("按键一被按下");
        	//	Toast.makeText(this,"按键一启动", 0).show();
        		break;
        	
        	case R.id.button2:
        		System.out.println("按键二被按下");
        	//	Toast.makeText(this,"按键二启动", 0).show();
        		break;		
        	}	
    	}
    }
    
    public class MainActivity extends Activity {
        
    
    	Button btn1;
    	Button btn2;
    	
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
        
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		
    		btn1 = (Button) findViewById(R.id.button1);		//	通过 R 文件里头 组件的ID寻找组件
    		btn2 = (Button) findViewById(R.id.button2);
    		
    		btn1.setOnClickListener(new MyClickedHandle());	//	通过创建自己定义的类对象，进行响应调用
    		btn2.setOnClickListener(new MyClickedHandle());
    	}
    }

# （二）通过匿名内部类，把组件和事件绑定 #

**把每个组件想要实现的功能定义，放在匿名类下方法实现**

public class MainActivity extends Activity {
        
    
    	Button btn1;
    	Button btn2;
    	
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
        
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		
    		btn1 = (Button) findViewById(R.id.button1);
    		btn2 = (Button) findViewById(R.id.button2);
    		
    		btn1.setOnClickListener( new OnClickListener() {
        
    			
    			@Override
    			public void onClick(View arg0) {
        
    				// TODO Auto-generated method stub
    				System.out.println("按键一被按下");
    	    		Toast.makeText(MainActivity.this,"按键一启动", 0).show();
    			}
    		});
    		
    		btn2.setOnClickListener(new View.OnClickListener() {
        
    			
    			@Override
    			public void onClick(View arg0) {
        
    				// TODO Auto-generated method stub
    				System.out.println("按键二被按下");
    	    		Toast.makeText(MainActivity.this,"按键二启动", 0).show();
    			}
    		});
    	}
    }

# （三）采用view 对象调用onClick #

**通过view 需要在 activity\_main 下 组件中 加入 onclick 引用的方法名字**

public class MainActivity extends Activity {
        
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
        
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    	}
    
    	public void buttonClickShow(View v)
        {
        
        	switch(v.getId())
        	{
        
        	case R.id.button1:
        		System.out.println("按键一被按下");
        		Toast.makeText(this,"按键一启动", 0).show();
        		break;
        	
        	case R.id.button2:
        		System.out.println("按键二被按下");
        		Toast.makeText(this,"按键二启动", 0).show();
        		break;		
        	}
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoaW5lc2Vrb2Jl_size_16_color_FFFFFF_t_70]

# (四)在当前Activity实现监听接口 #

> 此方法要先使当前Activity继承接口View.OnClickListener

public class MainActivity extends Activity implements View.OnClickListener {
        
    
    	Button btn1;
    	Button btn2;
    	
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
        
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		
    		btn1 = (Button) findViewById(R.id.button1);
    		btn2 = (Button) findViewById(R.id.button2);
    		
    		btn1.setOnClickListener(this);
    		btn2.setOnClickListener(this);
    	}
    	@Override
    	public void onClick(View v) {
        
    		// TODO Auto-generated method stub
    		switch(v.getId())
        	{
        
        	case R.id.button1:
        		System.out.println("按键一被按下");
        		Toast.makeText(this,"按键一启动", 0).show();
        		break;
        	
        	case R.id.button2:
        		System.out.println("按键二被按下");
        		Toast.makeText(this,"按键二启动", 0).show();
        		break;  		
        	}
    	}
    }

**目前在简单初学安卓知识，gogogogogo，共同努力前行**

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