Summary of four common writing methods for Android button click events

Many people who study Android programming will find that everyone has different preferences for how to write code. The most obvious one is the different way of writing controls to respond to events. Therefore, this article will summarize these writing methods and compare the advantages and disadvantages of various writing methods. I hope it can be of certain reference value for everyone to flexibly choose encoding methods.

The xml file code is as follows:

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button1" />
 
  <Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button2" />

The four methods are described as follows:

Anonymous internal class:

public class TestButtonActivity extends Activity {
 
  Button btn1, btn2;
  Toast tst;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test_button);
 
    btn1 = (Button) findViewById(R.id.button1);
    btn2 = (Button) findViewById(R.id.button2);
 
    btn1.setOnClickListener(new OnClickListener() {
 
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast tst = Toast.makeText(TestButtonActivity.this, "111111111", Toast.LENGTH_SHORT);
        tst.show();
 
      }
    });
 
    btn2.setOnClickListener(new OnClickListener() {
 
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast tst = Toast.makeText(TestButtonActivity.this, "222222222", Toast.LENGTH_SHORT);
        tst.show();
      }
    });
  }
}

Customized click event listening class:

public class TestButtonActivity extends Activity {
 
  Button btn1, btn2;
  Toast tst;
 
  class MyClickListener implements OnClickListener {
 
    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      switch (v.getId()) {
      case R.id.button1:
        tst = Toast.makeText(TestButtonActivity.this, "111111111", Toast.LENGTH_SHORT);
        tst.show();
        break;
      case R.id.button2:
        tst = Toast.makeText(TestButtonActivity.this, "222222222", Toast.LENGTH_SHORT);
        tst.show();
        break;
      default:
        break;
      }
    }
  }
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test_button);
 
    btn1 = (Button) findViewById(R.id.button1);
    btn2 = (Button) findViewById(R.id.button2);
 
    btn1.setOnClickListener(new MyClickListener());
    btn2.setOnClickListener(new MyClickListener());
  }
}

Activity inherits View.OnClickListener, and the Activity implements the OnClick(View view) method. In the OnClick(View view) method, switch-case is used to process the buttons represented by different IDs accordingly

public class TestButtonActivity extends Activity implements OnClickListener {
 
  Button btn1, btn2;
  Toast tst;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test_button);
 
    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:
      tst = Toast.makeText(this, "111111111", Toast.LENGTH_SHORT);
      tst.show();
      break;
    case R.id.button2:
      tst = Toast.makeText(this, "222222222", Toast.LENGTH_SHORT);
      tst.show();
      break;
    default:
      break;
    }
  }
}

The last one is a way of writing that I saw today. In the XML file, "display the onClick attribute of the specified button, so that when the button is clicked, the click() method in the corresponding Activity will be called by reflection"

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="onClick"
    android:text="Button1" />
 
  <Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="onClick"
    android:text="Button2" />

Here, when I press Alt+/ after typing android:, there will be a prompt for the onClick attribute. However, when I press Alt+/ after typing android:onClick="", there is no prompt for the onClick option, which suddenly made me feel like there is something wrong here. .

public class TestButtonActivity extends Activity {
 
  Button btn1, btn2;
  Toast tst;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test_button);
  }
 
  // 注意 这里没有 @Override 标签
  public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case R.id.button1:
      tst = Toast.makeText(this, "111111111", Toast.LENGTH_SHORT);
      tst.show();
      break;
    case R.id.button2:
      tst = Toast.makeText(this, "222222222", Toast.LENGTH_SHORT);
      tst.show();
      break;
    default:
      break;
    }
  }
}

This way of writing can realize the button click event without declaring the button.

The above are four ways to implement the button click event. #A rough summary is that it is faster to use anonymous internal classes when there are few buttons, such as when writing demo tests or login interfaces.

When there are many buttons, I still choose the third method, which is more convenient. .

Regarding the fourth method, I think it is the most convenient, but after reading a lot of code, I still feel that the writing method is not popular enough. I believe that there will be a lot of gains from studying this.

I hope this article will be helpful to everyone's learning of Android programming

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