运行时权限实例--拨打电话Demo

CALL_PHONE是权限管理的危险权分类；因此涉及到运行时权限的相关问题

下面是自己学习的Demo,简单的布局，一个按钮拨打电话

如下

mian_layou.xml

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

    <Button
        android:id="@+id/make_call"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="打电话" />


</LinearLayout>

MaiNactivity.java

package com.example.shanshui.runtimepermissiontest;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button callphone = (Button) findViewById(R.id.make_call);
        callphone .setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE)
                         != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{
                            Manifest.permission.CALL_PHONE},1);
                }else {
                    call();
                }
            }
        });
}

    private void call() {
        try {
            Intent it = new Intent(Intent.ACTION_CALL);
            it.setData(Uri.parse("tel:10086"));
            startActivity(it);
        }catch (SecurityException e){
            e.printStackTrace();
        }
    }

    @Override
 /*   onRequestPermissionsResult方法的参数第一个是请求码，第二个是要申请权限的权限名的数组，
    用户对授权的结果*/
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case 1:
                if (grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
                    call();
                }else {
                    Toast.makeText(this, "您取消了授权", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
        }
    }
}

其中的逻辑很简单；需要注意的是我们需要在清单文件中注册用户授权；

在7.0上的运行结果：