android应用调用系统拨打电话

调用系统拨打电话功能，写了一个用例
在AndroidManifest.xml中配置所需要的权限
<uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>

CallActivity.java

package com.example.a20200712;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class CallActivity extends AppCompatActivity {
    private EditText editText;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.call_layout);
        editText = findViewById(R.id.call_layout_number);
    }
    public  void calltel(View view){
       String number = editText.getText().toString();
        Log.i("mw","===="+number);

        //android6版本获取动态权限
        if (Build.VERSION.SDK_INT >= 23) {
            int REQUEST_CODE_CONTACT = 101;
            String[] permissions = {Manifest.permission.CALL_PHONE};
            //验证是否许可权限
            for (String str : permissions) {
                if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {
                    //申请权限
                    this.requestPermissions(permissions, REQUEST_CODE_CONTACT);
                    return;
                }
            }
        }
        //如果需要手动拨号将Intent.ACTION_CALL改为Intent.ACTION_DIAL（跳转到拨号界面，用户手动点击拨打）
        Intent intent = new Intent(Intent.ACTION_CALL);
        Uri data = Uri.parse("tel:" +number);
        intent.setData(data);
        startActivity(intent);
    }
}

call_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:id="@+id/call_layout_number"
        android:hint="请输入手机号">
    </EditText>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:onClick="calltel"
        android:text="拨打电话"></Button>

</LinearLayout>