android学习之使用Intent

学习android已经有一个星期左右了，今天看教程试着做了个电话拨号器，比较简单，用到Intent这个类。下面放上代码:

package org.leepood.dialog;

 import android.app.Activity;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
import android.widget.TextView;

public class phoneactivity extends Activity {
    /** Called when the activity is first created. */
    private Button btn;
    private EditText editmobile;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        editmobile=(EditText)this.findViewById(R.id.editmobile);
        btn=(Button)this.findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {//设置按钮单击事件
            
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+editmobile.getText().toString()));//Intent用来调用系统服务
                startActivity(intent);
                
            }
        });
    }
}

 

 

布局代码:

<?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="@string/txttitle"
    />
    <EditText 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editmobile"
        />
        <Button 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/btn"
            android:text="@string/btndialog"
            ></Button>
</LinearLayout>

 

 

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7 <TextView  
 8     android:layout_width="fill_parent" 
 9     android:layout_height="wrap_content" 
10     android:text="@string/txttitle"
11     />
12     <EditText 
13         android:layout_width="fill_parent"
14         android:layout_height="wrap_content"
15         android:id="@+id/editmobile"
16         />
17         <Button 
18             android:layout_width="wrap_content"
19             android:layout_height="wrap_content"
20             android:id="@+id/btn"
21             android:text="@string/btndialog"
22             ></Button>
23 </LinearLayout>
24 

 

下面是加入的权限代码:

<uses-permission android:name="android.permission.CALL_PHONE"/>

界面效果: