Android初体验-电话拨号APP

对Android很感兴趣，试着玩儿了一下，好玩儿，嘻嘻。按照这篇文章把环境搭好，我用的真机测试，记得把手机调成USB调试模式。

布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.yangl.myphone.MainActivity">

<TextView android:text="请输入电话号码！"
android:textSize="28sp"
android:textColor="#492f8f"
android:layout_width="368dp"
android:layout_height="wrap_content"
android:id="@+id/textView"
tools:layout_constraintTop_creator="1"
android:layout_marginStart="87dp"
android:layout_marginTop="3dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginLeft="87dp" />
<EditText
android:id="@+id/et_phonenumber"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="此处输入phone number"
android:inputType="phone"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
android:layout_marginStart="86dp"
android:layout_marginEnd="86dp"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="86dp"
android:layout_marginRight="86dp"
app:layout_constraintHorizontal_bias="0.0" />

<Button
android:id="@+id/bt"
android:layout_width="88dp"
android:layout_height="wrap_content"
android:text="拨打"
android:textSize="22sp"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/et_phonenumber"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintHorizontal_bias="0.51" />

</android.support.constraint.ConstraintLayout>

主程序:MainActivity.java

package com.example.yangl.myphone;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;
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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//拿到button对象
Button bt = (Button) findViewById(R.id.bt);
//给按钮设置一个点击侦听
bt.setOnClickListener(new MyListener());
}
class MyListener implements View.OnClickListener{
//当按钮被点击时，此方法被调用
@Override
public void onClick(View v) {
//拿到输入框对象
EditText et= (EditText) findViewById(R.id.et_phonenumber);
//拿到用户输入的电话号码,
String phonenumber = et.getText().toString();
//告诉系统我要打电话
//创建意图独享
Intent intent = new Intent();
//设置意图对象要执行的动作
intent.setAction(Intent.ACTION_CALL);
/* 设置号码，你要打给谁 */
intent.setData(Uri.parse("tel:"+phonenumber));
//启动打电话应用
startActivity(intent);
}
}
}

把电话权限开启，在AndroidMainfest中加上:

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

把配置中APP运行的Target选择为USB Device，大功告成！