设置监听

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：