Android为自定义控件添加事件

1）文章简介

创建自定义控件并为它添加一个自定义事件

当用户单击自定义控件中的“测试”按钮时触发按钮自定义事件

2）定义一个layout（activity_custom.xml）作为自定义控件的布局代码如下

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text" >

<requestFocus />
</EditText>

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

</LinearLayout>3）接下来写一个类(CustomUserControl.java)继承LinearLayout，导入刚刚的布局，添加自定义事件并通过单击“测试按钮”触发自定义事件
package com.example.androidtest2;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

public class CustomUserControl extends LinearLayout{

/*定义接口*/
public interface IMyClick{
public void onMyClick(String str);
}
/*初始化接口变量*/
IMyClick iMyClick=null;
/*自定义事件*/
public void setOnMyClickListener(IMyClick _iMyClick){
iMyClick=_iMyClick;
}
private Button button1=null;
private EditText editText1=null;
public CustomUserControl(Context context){
super(context);
}
public CustomUserControl(Context context, AttributeSet attr){
super(context, attr);
LayoutInflater layoutInflater=
(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
layoutInflater.inflate(R.layout.activity_custom, this);
editText1=(EditText)findViewById(R.id.editText1);
/*设置按钮的点击事件*/
button1=(Button)findViewById(R.id.button1);
button1.setOnClickListener(new Button.OnClickListener() {

@Override
public void onClick(View v) {
/*使用回调实现返回editText1内容*/
iMyClick.onMyClick(editText1.getText().toString());
}
});
}
/*为Button按钮添加内容*/
public void setButtonText(String text){
button1.setText(text);
}

}4）前台(activity_main.xml)调用自定义控件代码如下
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<com.example.androidtest2.CustomUserControl
android:id="@+id/customUserControl1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</com.example.androidtest2.CustomUserControl>

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />

</LinearLayout>4）后台(MainActivity.java)触发自定义事件代码如下
package com.example.androidtest2;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

private CustomUserControl customUserControl1=null;
private TextView textView1=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView1=(TextView)findViewById(R.id.textView1);
customUserControl1=(CustomUserControl)findViewById(R.id.customUserControl1);
customUserControl1.setButtonText("测试");
customUserControl1.setOnMyClickListener(new CustomUserControl.IMyClick() {

@Override
public void onMyClick(String str) {
textView1.setText(str);
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}