1.布局文件:

activity_main.xml

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 class MainActivity extends ActionBarActivity implementsOnClickListener {//用于输入电话号码的文本框

privateEditText et_number;

@Overrideprotected voidonCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);//获得号码文本输入框

et_number =(EditText)findViewById(R.id.et_number);//获得拨号按钮

Button bt_dial =(Button)findViewById(R.id.bt_dial);

bt_dial.setOnClickListener(this);

}//实现各种控件的点击事件

@Overridepublic voidonClick(View v) {switch(v.getId()) {caseR.id.bt_dial:

callPhone();break;default:break;

}

}//实现拨号操作

private voidcallPhone() {//获取号码输入框的号码

String number =et_number.getText().toString().trim();//进行非空判断

if(TextUtils.isEmpty(number)){//给用户提示

Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_LONG).show();

return;

}//开启拨号服务

Intent intent = newIntent();

intent.setAction(Intent.ACTION_CALL);

intent.setData(Uri.parse("tel:"+number));

startActivity(intent);

}

}

3.常见错误

错误描述:

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

原因:没有给应用程序添加拨号的权限,添加方法如下图.