目錄

1.在布局中指定onClick屬性

布局代碼

android:id="@+id/btn1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="button1"

android:onClick="click"

/>

android:id="@+id/btn2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="button2"

android:layout_below="@+id/btn1"

android:onClick="click"

/>

邏輯代碼

public void click(View v){

if(v.getId()==R.id.btn1)

Toast.makeText(this,"button1 is clicked",Toast.LENGTH_SHORT).show();

if(v.getId()==R.id.btn2)

Toast.makeText(this,"button2 is clicked",Toast.LENGTH_SHORT).show();

}

2.使用匿名內部類

public class MainActivity extends AppCompatActivity {

private Button btn1;

private Button btn2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.buttonclick);

//通過findViewById()初始化控件

btn1=(Button) findViewById(R.id.btn1);

btn2=(Button) findViewById(R.id.btn2);

//匿名內部類

btn1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

btn1.setText("button1 is clicked");

}

});

btn2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

btn2.setText("button2 is clicked");

}

});

}

}

3.在當前Activity中實現OnClickListener接口

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

private Button btn1;

private Button btn2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.buttonclick);

//通過findViewById()初始化控件

btn1=(Button) findViewById(R.id.btn1);

btn2=(Button) findViewById(R.id.btn2);

btn1.setOnClickListener(this);

btn2.setOnClickListener(this);

}

public void onClick(View v){

if(v.getId()==R.id.btn1){

Toast.makeText(this,"button1 is clicked",Toast.LENGTH_SHORT).show();

}

if(v.getId()==R.id.btn2){

Toast.makeText(this,"button2 is clicked",Toast.LENGTH_SHORT).show();

}

}

}

4.創建內部類

public class MainActivity extends AppCompatActivity {

private Button btn1;

private Button btn2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.buttonclick);

//通過findViewById()初始化控件

btn1=(Button) findViewById(R.id.btn1);

btn2=(Button) findViewById(R.id.btn2);

//傳入實現了OnClickListener接口的類的對象

btn1.setOnClickListener(new MyClickListener());

btn2.setOnClickListener(new MyClickListener());

}

//創建內部類實現OnClickListener接口

private class MyClickListener implements View.OnClickListener{

@Override

public void onClick(View v){

if(v.getId()==R.id.btn1)

btn1.setText("button1 is clicked");

if(v.getId()==R.id.btn2)

btn2.setText("button2 is clicked");

}

}

}