使用Intent打开一个Dial界面
1.新建项目：

2.打开main.xml删除TextView控件
如：

3.编辑AndroidPhoneDialer.java
package android_programmer_guide.androidphonedialer;import android.app.Activity;import android.os.Bundle;import android.content.Intent;import android.net.Uri;public class AndroidPhoneDialer extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Intent DialIntent = new Intent(Intent.ACTION_DIAL,Uri.parse("tel:13632783420"));       // DialIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        DialIntent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);        startActivity(DialIntent);    }}