如何在android中创建多个onClick方法

Question

我试图制作一个具有多个按钮的应用程序，并且当每个按钮被按下时，它将启动一个新的计时器并在分配给该按钮的文本视图上显示时间。我已经成功地让其中一个按钮创建了一个工作计时器，但是我无法使另一个按钮对不同的文本视图执行相同的操作。我不知道如何创建多个onCLick方法。

编辑：我试图让wolvesbutton做与wratihsbutton相同的东西，但有一个单独的计时器，并将其显示在不同的文本视图上。

这是我到目前为止有：

import java.util.Timer; 
import java.util.TimerTask; 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.os.Handler.Callback; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 

public class MainActivity extends Activity { 
    TextView textView5, textView6, textView7; 
    long starttime = 0; 
    //this posts a message to the main thread from our timertask 
    //and updates the textfield 
    final Handler h = new Handler(new Callback() { 

     @Override 
     public boolean handleMessage(Message msg) { 
      long millis = System.currentTimeMillis() - starttime; 
      int seconds = (int) (millis/1000); 
      int minutes = seconds/60; 
      seconds  = seconds % 60; 

      textView5.setText(String.format("%d:%02d", minutes, seconds)); 
      return false; 

     } 
    }); 
    //runs without timer be reposting self 
    Handler h2 = new Handler(); 
    Runnable run = new Runnable() { 

     @Override 
     public void run() { 
      long millis = System.currentTimeMillis() - starttime; 
      int seconds = (int) (millis/1000); 
      int minutes = seconds/60; 
      seconds  = seconds % 60; 

      textView5.setText(String.format("%d:%02d", minutes, seconds)); 

      h2.postDelayed(this, 500); 

      if(seconds >= 10 || minutes >= 1){ 
       textView5.setText("Ready"); 
      } 
     } 
    }; 

    //tells handler to send a message 
    class firstTask extends TimerTask { 

     @Override 
     public void run() { 
      h.sendEmptyMessage(0); 
     } 
    }; 

    //tells activity to run on ui thread 
    class secondTask extends TimerTask { 

     @Override 
     public void run() { 
      MainActivity.this.runOnUiThread(new Runnable() { 

       @Override 
       public void run() { 
        long millis = System.currentTimeMillis() - starttime; 
        int seconds = (int) (millis/1000); 
        int minutes = seconds/60; 
        seconds  = seconds % 60; 

        textView6.setText(String.format("%d:%02d", minutes, seconds)); 
       } 
      }); 
     } 
    }; 

    class wolvesFirstTask extends TimerTask { 

     @Override 
     public void run() { 
      h.sendEmptyMessage(0); 
     } 
    }; 

    //tells activity to run on ui thread 
    class wolvesSecondTask extends TimerTask { 

     @Override 
     public void run() { 
      MainActivity.this.runOnUiThread(new Runnable() { 

       @Override 
       public void run() { 
        long millis = System.currentTimeMillis() - starttime; 
        int seconds = (int) (millis/1000); 
        int minutes = seconds/60; 
        seconds  = seconds % 60; 

        textView6.setText(String.format("%d:%02d", minutes, seconds)); 
       } 
      }); 
     } 
    }; 


    Timer wraiths = new Timer(); 
    Timer wolves = new Timer(); 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     textView5 = (TextView)findViewById(R.id.textView5); 
     textView6 = (TextView)findViewById(R.id.textView5); 


     Button wraithsbutton = (Button)findViewById(R.id.wraithsb); 
     Button wolvesbutton = (Button)findViewById(R.id.wolvesb); 
     wraithsbutton.setText("Start"); 
     wraithsbutton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       Button wraithsbutton = (Button)v; 
       if(wraithsbutton.getText().equals("Stop")){ 
        wraiths.cancel(); 
        wraiths.purge(); 
        h2.removeCallbacks(run); 
        wraithsbutton.setText("Start"); 
       }else{ 
        starttime = System.currentTimeMillis(); 
        wraiths = new Timer(); 
        wraiths.schedule(new firstTask(), 0,500); 
        wraiths.schedule(new secondTask(), 0,500); 
        h2.postDelayed(run, 0); 
        wraithsbutton.setText("Stop"); 

       } 
      } 

     }); 


    } 




} 

Answer 1

您需要添加实施后的扩展类 关键字，然后你要重写的onClick方法这样

public class Example extends Activity implements OnClickListener { 

    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.menulayout); 

      Button button1 = (Button) findViewById(R.id.b1); 
      button1.setOnClickListener(this); 

      Button button2 = (Button) findViewById(R.id.b2); 
      button2.setOnClickListener(this); 

      Button button3 = (Button) findViewById(R.id.b3); 
      button3.setOnClickListener(this); 
} 

@Override 
public void onClick(View v) { 
     if(v.getId() == R.id.b1) 
     { 
      //do something here if button1 is clicked 
     } 
     else if (v.getId() == R.id.b2) 
     { 
      //do something here if button2 is clicked 
     } 
     else if (v.getId() == R.id.b3) 
     { 
      //do something here if button3 is clicked 
     } 
    } 

} 

Answer 2

基本上像这样：

public class MyButton extends Button implements View.OnClickListener{ 
    private TextView tv; /// or ArrayList<TextView> tvs; 

     public MyButton(Context context,TextView tv) { 
      super(context); 
      this.tv = tv; ///your text views to be set make as many as you want or pass an array of text views if you like List<? extends TextView> as a constructor param 
      setOnClickListener(this); 

     } 

     public void onClick(View view) { 
       //run your tasks here 
       //set the textviews as you like - 

     } 


     public MyButton(Context context, AttributeSet attrs) { 
      super(context, attrs); 
      setOnClickListener(this); 
     } 

     public MyButton(Context context, AttributeSet attrs, int defStyle) { 
      super(context, attrs, defStyle); 
      setOnClickListener(this); 
     } 
    } 

---

希望它会给你一些想法

Answer 3

一个无关的建议;我会把时间显示放到一个方法中，因为相同的代码在4个地方。

private void showElapsedTime(long elapsedTime, TextView textView) { 
    int seconds = (int) (elapsedTime/1000); 
    int minutes = seconds/60; 
    seconds  = seconds % 60; 
    textView.setText(String.format("%d:%02d", minutes, seconds)); 
} 

private void showElapsedTimeOnUiThread(final long elapsedTime, final TextView textView) { 
    runOnUiThread(new Runnable() { 
     @Override 
     public void run() { 
      showElapsedTime(elapsedTime, textView); 
     } 
    }); 
} 

从4个位置调用这些方法。

E.g.

Runnable run = new Runnable() { 
    @Override 
    public void run() { 
     showElapsedTime(System.currentTimeMillis() - starttime, textView5); 

和

class secondTask extends TimerTask { 
    @Override 
    public void run() { 
     showElapsedTimeOnUiThread(System.currentTimeMillis() - starttime, textView6)); 
    } 

例如。