android studio按钮监听的5种方法实例详解
1.匿名内部类
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn1 = findViewById(R.id.btn1);//匿名内部类
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), “你点击了按钮1”, Toast.LENGTH_LONG).show();
}
});
}
2.内部类
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn2 = findViewById(R.id.btn2);
Btn2CLickListener btn2CLickListener = new Btn2CLickListener();
btn2.setOnClickListener(btn2CLickListener);
}
class Btn2CLickListener implements View.OnClickListener{
@Override
public void onClick(View v){
Toast.makeText(getApplicationContext(),“你点击了按钮2”,Toast.LENGTH_LONG).show();
}
}
3外部类**
MainActivity.java：
public class MainActivity extends AppCompatActivity{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
Button btn3 = findViewById(R.id.btn3);
Btn3ClickListener btn3CLickListener = new Btn3ClickListener(getApplicationContext());
btn3.setOnClickListener(btn3CLickListener);
}
Btn3ClickListener.java：
4自身activity
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn4 = findViewById(R.id.btn4);//main activity
btn4.setOnClickListener(this);
}
public void onClick(View v) {
Toast.makeText(getApplicationContext(), “你点击了按钮4”, Toast.LENGTH_SHORT).show();
}
}
5直接绑定到标签
activity_main.xml：
添加 android:onClick=“myClick”。如下所示：
MainActivity.java：
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public void myClick(View view) {
Toast.makeText(getApplicationContext(), “你点击了按钮5”, Toast.LENGTH_SHORT).show();
}
}
总结
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