Android开发——拨打电话的实现

在拨打电话的时候，首先要在AndroidManifest中添加user—permission,这样就实现了对拨打电话的声明，然后通过自定义的Intent对象，通过ACTION_CALL 键和Uri.parse()方法将用户输入的电话号码输入，完成拨打的功能。

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

程序清单：

MainActivity.java

package xiaocool.net.textmobile;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
    private Button bt;
    private EditText ed;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt=(Button)findViewById(R.id.button);
        ed=(EditText)findViewById(R.id.ed);
        bt.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View V){
                try
                {
                   String input=ed.getText().toString();
                    if(input.trim().length()!=0){
                        Intent phoneIntent = new Intent("android.intent.action.CALL",Uri.parse("tel:" + input));
                      startActivity(phoneIntent);
                    }else{

                       Toast.makeText(MainActivity.this, "不能输入为空", Toast.LENGTH_LONG).show();
                      }

                }catch(Exception e){
                        e.printStackTrace();
                }
            }
        });
    }

layout_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<EditText
    android:id="@+id/ed"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    android:layout_above="@+id/button"
    />
    <Button
        android:id="@+id/button"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="拨打"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

效果图：