常用控件的事件监听

下面是各种常用控件的事件监听的使用

①EditText（编辑框）的事件监听---OnKeyListener

②RadioGroup、RadioButton（单选按钮）的事件监听---OnCheckedChangeListener

③CheckBox（多选按钮）的事件监听---OnCheckedChangeListener

④Spinner（下拉列表）的事件监听---OnItemSelectedListener

⑤Menu（菜单）的事件处理---onMenuItemSelected

⑥Dialog（对话框）的事件监听---DialogInterface.OnClickListener()

第一个例子：EditText的事件监听

package org.hualang.eventtest2;

import android.app.Activity;

import android.os.Bundle;

import android.view.KeyEvent;

import android.view.View;

import android.widget.EditText;

import android.widget.TextView;

public class EventTest2 extends Activity {

/** Called when the activity is first created. */

private TextView mytext;

private EditText edittext;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mytext = (TextView)findViewById(R.id.mytext);

edittext = (EditText)findViewById(R.id.edittext);

/**

* 设置当EditText为空，则提示“请输入账号”

* 在配置文件main.xml中可以用android:hint="请输入账号"来实现

*/

edittext.setHint("请输入账号");

//下面为EditText事件监听

edittext.setOnKeyListener(new EditText.OnKeyListener()

{

@Override

public boolean onKey(View arg0, int arg1, KeyEvent arg2) {

//得到文字，显示在TextView中

mytext.setText("内容："+edittext.getText().toString());

return false;

}

});

}

}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:id="@+id/mytext"

/>

<EditText

android:id="@+id/edittext"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:textSize="10pt"

/>

</LinearLayout>

运行结果如下：





第二个例子：单选按钮的事件监听处理

package org.hualang.eventtest;

import android.app.Activity;

import android.os.Bundle;

import android.view.Gravity;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.Toast;

public class EventTest3 extends Activity {

/** Called when the activity is first created. */

private RadioGroup group;

private RadioButton radio1,radio2,radio3,radio4;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

group = (RadioGroup)findViewById(R.id.radiogroup1);

radio1 = (RadioButton)findViewById(R.id.button1);

radio2 = (RadioButton)findViewById(R.id.button2);

radio3 = (RadioButton)findViewById(R.id.button3);

radio4 = (RadioButton)findViewById(R.id.button4);

group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override

public void onCheckedChanged(RadioGroup group, int checkedId) {

// TODO Auto-generated method stub

if (checkedId == radio2.getId())

{

showMessage("正确答案：" + radio2.getText()+",恭喜你，答对了");

}

else

{

showMessage("对不起，虽然很多，但不是公认的最多");

}

}

});

}

public void showMessage(String str)

{

Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);

toast.setGravity(Gravity.TOP, 0, 220);

toast.show();

}

}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:id="@+id/mytextview"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="哪个城市的美女最多？"

/>

<RadioGroup

android:id="@+id/radiogroup1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="vertical"

>

<RadioButton

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="杭州"

/>

<RadioButton

android:id="@+id/button2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="重庆"

/>

<RadioButton

android:id="@+id/button3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="成都"

/>

<RadioButton

android:id="@+id/button4"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="香港"

/>

</RadioGroup>

</LinearLayout>

运行结果如下：



第三个例子：复选框的事件处理

package org.hualang.eventtest4;

import android.app.Activity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.View;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import android.widget.CompoundButton.OnCheckedChangeListener;

import android.widget.Toast;

public class EventTest4 extends Activity {

/** Called when the activity is first created. */

private CheckBox ch1,ch2,ch3,ch4,ch5;

private Button mybutton;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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

ch1 = (CheckBox)findViewById(R.id.check1);

ch2 = (CheckBox)findViewById(R.id.check2);

ch3 = (CheckBox)findViewById(R.id.check3);

ch4 = (CheckBox)findViewById(R.id.check4);

ch5 = (CheckBox)findViewById(R.id.check5);

ch1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()

{

@Override

public void onCheckedChanged(CompoundButton arg0, boolean arg1) {

// TODO Auto-generated method stub

if(ch1.isChecked())

{

showMessage("你选择了"+ch1.getText());

}

}

});

ch2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()

{

@Override

public void onCheckedChanged(CompoundButton arg0, boolean arg1) {

// TODO Auto-generated method stub

if(ch3.isChecked())

{

showMessage("你选择了"+ch2.getText());

}

}

});

ch3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()

{

@Override

public void onCheckedChanged(CompoundButton arg0, boolean arg1) {

// TODO Auto-generated method stub

if(ch3.isChecked())

{

showMessage("你选择了"+ch3.getText());

}

}

});

ch4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()

{

@Override

public void onCheckedChanged(CompoundButton arg0, boolean arg1) {

// TODO Auto-generated method stub

if(ch4.isChecked())

{

showMessage("你选择了"+ch4.getText());

}

}

});

ch5.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()

{

@Override

public void onCheckedChanged(CompoundButton arg0, boolean arg1) {

// TODO Auto-generated method stub

if(ch5.isChecked())

{

showMessage("你选择了"+ch5.getText());

}

}

});

mybutton.setOnClickListener(new Button.OnClickListener()

{

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

int num = 0;

if(ch1.isChecked())

{

num++;

}

if(ch2.isChecked())

{

num++;

}

if(ch3.isChecked())

{

num++;

}

if(ch4.isChecked())

{

num++;

}

if(ch5.isChecked())

{

num++;

}

showMessage("谢谢参与，您一共选择了"+num+"项");

}

});

}

public void showMessage(String str)

{

Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);

toast.setGravity(Gravity.TOP, 0, 220);

toast.show();

}

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="你喜欢哪些智能手机系统"

/>

<CheckBox

android:id="@+id/check1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="苹果 ios"

/>

<CheckBox

android:id="@+id/check2"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="谷歌 Android"

/>

<CheckBox

android:id="@+id/check3"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="RIM BlackBerry"

/>

<CheckBox

android:id="@+id/check4"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="微软 Windows phone 7"

/>

<CheckBox

android:id="@+id/check5"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="诺基亚 symbian"

/>

<Button

android:id="@+id/mybutton"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="确定"

/>

</LinearLayout>

运行结果：



第四个例子：Spinner下拉菜单的事件处理

package org.hualang.eventtest5;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.TextView;

public class EventTest5 extends Activity {

/** Called when the activity is first created. */

private static final String[] citys={"杭州","北京","成都","大连","深圳","南京"};

private TextView text;

private Spinner spinner;

private ArrayAdapter<String> adapter;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

text=(TextView)findViewById(R.id.text);

spinner=(Spinner)findViewById(R.id.spinner);

//将可选内容与ArrayAdapter连接

adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,citys);

//设置下拉列表风格

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

//将adapter添加到spinner中

spinner.setAdapter(adapter);

//添加Spinner事件监听

spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener()

{

@Override

public void onItemSelected(AdapterView<?> arg0, View arg1,

int arg2, long arg3) {

// TODO Auto-generated method stub

text.setText("你所在的城市是："+citys[arg2]);

//设置显示当前选择的项

arg0.setVisibility(View.VISIBLE);

}

@Override

public void onNothingSelected(AdapterView<?> arg0) {

// TODO Auto-generated method stub

}

});

}

}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:id="@+id/text"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="您所在的城市"

/>

<Spinner

android:id="@+id/spinner"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

/>

</LinearLayout>

运行结果如下：







第五个例子：Menu（菜单）的事件处理

package org.hualang.eventtest6;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.widget.Toast;

public class EventTest6 extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// TODO Auto-generated method stub

MenuInflater inflater = getMenuInflater();

//设置menu界面为res/menu/menu.xml

inflater.inflate(R.menu.menu, menu);

return true;

}

@Override

public boolean onMenuItemSelected(int featureId, MenuItem item) {

//得到当前选中的MenuItem的ID

int itemId = item.getItemId();

switch(itemId)

{

case R.id.apple:

Toast toast = Toast.makeText(this, "这是苹果", Toast.LENGTH_SHORT);

toast.show();

break;

case R.id.banana:

Toast toast2 = Toast.makeText(this, "这是香蕉", Toast.LENGTH_SHORT);

toast2.show();

break;

case R.id.exit:

EventTest6.this.finish();

break;

}

return true;

}

}

res/menu/menu.xml

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">

<item android:id="@+id/apple"

android:title="苹果"

/>

<item android:id="@+id/banana"

android:title="香蕉"

/>

<item android:id="@+id/exit"

android:title="退出"

/>

</menu>

运行结果如下：





第六个例子：对话框的事件处理

package org.hualang.dialog;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.Dialog;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

public class MainActivity extends Activity {

/** Called when the activity is first created. */

ProgressDialog myDialog;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Dialog dialog = new AlertDialog.Builder(MainActivity.this)

.setTitle("登录提示")

.setMessage("这里需要登录")

.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

LayoutInflater factory = LayoutInflater.from(MainActivity.this);

final View DialogView = factory.inflate(R.layout.dialog, null);

AlertDialog dlg = new AlertDialog.Builder(MainActivity.this)

.setTitle("登录框")

.setView(DialogView)

.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int whichButton) {

// TODO Auto-generated method stub

myDialog = ProgressDialog.show(MainActivity.this, "请等待...", "正在为你登录", true);

new Thread()

{

public void run()

{

try

{

sleep(3000);

}catch(Exception e)

{

e.printStackTrace();

}finally

{

myDialog.dismiss();

}

}

}.start();

}

}).setNegativeButton("取消",

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

MainActivity.this.finish();

}

}).create();

dlg.show();

}

}).setNeutralButton("退出", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

MainActivity.this.finish();

}

}).create();

dialog.show();

}

}

res/layout/dialog.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:id="@+id/username"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="20dip"

android:layout_marginRight="20dip"

android:text="账号"

android:gravity="left"

android:textAppearance="?android:attr/textAppearanceMedium"

/>

<EditText

android:id="@+id/myusername"

android:layout_height="wrap_content"

android:layout_width="fill_parent"

android:layout_marginLeft="20dip"

android:layout_marginRight="20dip"

android:scrollHorizontally="true"

android:autoText="false"

android:capitalize="none"

android:gravity="fill_horizontal"

android:textAppearance="?android:attr/textAppearanceMedium"

/>

<TextView

android:id="@+id/password"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="20dip"

android:layout_marginRight="20dip"

android:text="密码"

android:gravity="left"

android:textAppearance="?android:attr/textAppearanceMedium"

/>

<EditText

android:id="@+id/mypassword"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="20dip"

android:layout_marginRight="20dip"

android:scrollHorizontally="true"

android:autoText="false"

android:capitalize="none"

android:gravity="fill_horizontal"

android:password="true"

/>

</LinearLayout>

运行结果：