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