Android中点击按钮的事件处理实现步骤

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1. 事件源

   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       tools:context=".chapter04.DownloadActivity">
   
       <Button
           android:id="@+id/btn_download"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerInParent="true"
           android:text="下载" />
   </RelativeLayout>
   

2. 设置事件

       private Button downloadBtn;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_download);
   
           downloadBtn = findViewById(R.id.btn_download);
           
           downloadBtn.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
   		     }
           });
       }
   

3. 处理事件

       private Button downloadBtn;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_download);
   
           downloadBtn = findViewById(R.id.btn_download);
           
           downloadBtn.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
   			       // 按钮点击触发，在这里触发下载事件
   		     }
           });
       }