Android申请动态权限记录

Android系统权限分为2类：正常权限和危险权限。
正常权限不会给用户隐私权带来风险。
危险权限会授予应用访问用户敏感数据的权限。
从Android 6.0开始，如果应用在AndroidManifest.xml中声明了危险权限，则需要用户明确批准，应用才可以使用这些权限。

简单代码示例
1.AndroidManifest.xml声明权限

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

2.代码中动态申请权限

package com.mine.permissiontest;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.widget.Toast;

public class MainActivity extends Activity {

    private static final String TAG = MainActivity.class.getSimpleName();
    private static final int REQUEST_CODE = 2010;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        requestPermission();
    }

    /*
    *权限申请方法
    */
    private void requestPermission() {
        Log.d(TAG, "requestPermission");
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            Log.d(TAG, "checkSelfPermission");
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, REQUEST_CODE);
        }
    }

    /**
     * 用户选择“允许”或“拒绝”后，回调此方法
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
        case REQUEST_CODE: {
            if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                Log.d(TAG, "onRequestPermissionsResult granted");
                Toast.makeText(this, "onRequestPermissionsResult denied", Toast.LENGTH_LONG).show();
            } else {
                Log.d(TAG, "onRequestPermissionsResult denied");
                Toast.makeText(this, "onRequestPermissionsResult denied", Toast.LENGTH_LONG).show();
            }
            break;
        }
        default:
            break;
        }
    }

}

3.运行测试代码，系统弹出请求权限的Dialog