android studio实现打电话

首先需要在Manifest中配置权限 

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

main.xml代码如下

android中有6中布局方式 TabLayout，RelativeLayou ，AbsoluteLayout，LinerLayout，GridLayout，FrameLayout

<?xml version="1.0" encoding="utf-8"?><android.widget.RelativeLayout    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="app.yu.com.test.Main">        <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="请输入电话号码"        tools:layout_editor_absoluteY="20dp"        tools:layout_editor_absoluteX="0dp"        tools:ignore="MissingConstraints" />    <EditText        android:id="@+id/edit"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:layout_marginTop="40dp"         />    <Button        android:id="@+id/bt1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="拨打电话"        android:layout_alignParentTop="false"        android:layout_marginTop="80dp"        /></android.widget.RelativeLayout>

main.java中的代码如下

package app.yu.com.test;import android.content.Intent;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class Main extends AppCompatActivity implements View.OnClickListener {    EditText editText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Button btn = (Button)this.findViewById(R.id.bt1);        btn.setOnClickListener(this);        editText = (EditText)findViewById(R.id.edit);    }    @Override    public void onClick(View v) {        Intent intent = new Intent();        intent.setAction(Intent.ACTION_CALL);        intent.setData(Uri.parse("tel:"+ editText.getText()));        startActivity(intent);        Toast.makeText(getApplicationContext(),"实现点击第三个按钮",Toast.LENGTH_LONG).show();    }}