Android Basics-Phone Dialer

1. layout file:

Activity_main.xml

<Relativelayoutxmlns: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:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context= "Com.itheima.callphone.MainActivity" >    <EditTextAndroid:id= "@+id/et_number"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentleft= "true"Android:layout_alignparentright= "true"Android:layout_alignparenttop= "true"Android:ems= "Ten" >        <Requestfocus/>    </EditText>    <ButtonAndroid:id= "@+id/bt_dial"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentright= "true"Android:layout_below= "@+id/et_number"Android:text= "@string/_dial" /></Relativelayout>

2.mainactivity.java

 PackageCom.itheima.callphone;Importandroid.content.Intent;ImportAndroid.net.Uri;ImportAndroid.os.Bundle;Importandroid.support.v7.app.ActionBarActivity;Importandroid.text.TextUtils;ImportAndroid.view.Menu;ImportAndroid.view.MenuItem;ImportAndroid.view.View;ImportAndroid.view.View.OnClickListener;ImportAndroid.widget.Button;ImportAndroid.widget.EditText;ImportAndroid.widget.Toast; Public classMainactivityextendsActionbaractivityImplementsOnclicklistener {//text box for entering a phone number    PrivateEditText Et_number; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); //get the Number text entry boxEt_number =(EditText) Findviewbyid (R.id.et_number); //Get dial-up buttonButton bt_dial =(Button) Findviewbyid (r.id.bt_dial); Bt_dial.setonclicklistener ( This); } @Override Public BooleanOncreateoptionsmenu (Menu menu) {//inflate the menu; This adds items to the action bar if it is present.getmenuinflater (). Inflate (R.menu.main, menu); return true; } @Override Public Booleanonoptionsitemselected (MenuItem item) {//Handle Action Bar item clicks here. The Action Bar would//automatically handle clicks on the Home/up button, so long//As you specify a the parent activity in Androidmanifest.xml.        intID =Item.getitemid (); if(id = =r.id.action_settings) {            return true; }        return Super. onoptionsitemselected (item); }    //implement click events for various controls@Override Public voidOnClick (View v) {Switch(V.getid ()) { CaseR.id.bt_dial:callphone ();  Break; default:             Break; }    }    //Implementing dial-up operations    Private voidCallphone () {//get the number of the Number entry boxString number =Et_number.gettext (). toString (). Trim (); //make a non-null judgment        if(Textutils.isempty (number)) {//Tips for usersToast.maketext (mainactivity. This, "Number cannot be empty", Toast.length_long). Show (); }        //Turn on Dial-up serviceIntent Intent =NewIntent ();        Intent.setaction (Intent.action_call); Intent.setdata (Uri.parse ("Tel:" +Number ));    StartActivity (Intent); }}

3. Common errors

Error Description:

Java.lang.SecurityException:Permission denial:starting Intent {act=android.intent.action.call dat=tel:xxx-xxx-xxxx cmp=com.android.phone/. Outgoingcallbroadcaster} from Processrecord{b76dbe10 1322:com.itheima.callphone/10032} (pid=1322, uid=10032) Requires Android.permission.CALL_PHONE

Cause: No dial-up permissions were added to the application, such as the Add method.

Android Basics-Phone Dialer