android电话拨号器

package cn.itcast.phone;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;public class MainActivity extends Activity {    private EditText mobileText;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        mobileText = (EditText) findViewById(R.id.mobile);        Button button = (Button) this.findViewById(R.id.button);        button.setOnClickListener(new ButtonClickListener());    }     private final class ButtonClickListener implements View.OnClickListener{public void onClick(View v) {String number = mobileText.getText().toString();Intent intent = new Intent();intent.setAction("android.intent.action.CALL");intent.setData(Uri.parse("tel:"+ number));startActivity(intent);//方法内部会自动为Intent添加类别：android.intent.category.DEFAULT}    }}

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