• 在各类流氓肆虐的安卓生态环境中,6.0之前是只要一安装app就能获取到所有需要的权限了。

    6.0之后,谷歌将权限分成了两种,一种普通权限,跟以前一样,AndroidManifest.xml中声明了就可以用了

    另一种是危险权限,在你的项目compileSdkVersion和targetSdkVersion均>=23的时候,这一类权限不仅需要在清单中声明,而且要在使用的时候向用户申请才行。如果还像6.0之前那样只是声明一下的话,分分钟崩给你看T.T~

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java.lang.SecurityException
getDeviceId: Neither user 10204 nor current process has android.permission.READ_PHONE_STATE...
}
1 java.lang.RuntimeException:Unable to start activity ComponentInfo{com.aidebar.d8alarmclock/com.aidebar.d8alarmclock.activity.MainActivity}: java.lang.SecurityException: getDeviceId: Neither user 10204 nor current process has android.permission.READ_PHONE_STATE.
2 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3254)
3 ......

我自己测试的时候,MIUI不会崩。。清单中配置了就直接获取了权限,导致我没有第一时间发现这个bug···

权限组 权限
CALENDAR READ_CALENDAR WRITE_CALENDAR
CAMERA CAMERA
CONTACTS READ_CONTACTS WRITE_CONTACTS GET_ACCOUNTS
LOCATION ACCESS_FINE_LOCATION ACCESS_COARSE_LOCATION
MICROPHONE RECORD_AUDIO
PHONE READ_PHONE_STATE CALL_PHONE READ_CALL_LOG WRITE_CALL_LOG ADD_VOICEMAIL USE_SIP PROCESS_OUTGOING_CALLS
SENSORS BODY_SENSORS
SMS SEND_SMS RECEIVE_SMS READ_SMS RECEIVE_WAP_PUSH RECEIVE_MMS
STORAGE READ_EXTERNAL_STORAGE WRITE_EXTERNAL_STORAGE

看完成效果吧

布局就不写了,点击按钮获取权限,让用户授权,用户点击允许拒绝我们都能获取到。

但这样就有个问题,当用户点击不在询问的时候,就什么也不干了。。这样显然对app的正常运行是有影响的,所以我选择如果是这种情况,给他个SnackBar引导用户去设置里手动打开权限。

下面上代码

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package com.aidebar.demo;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Activity mActivity;
public static final int REQUEST_CODE_PERMISSION = 1;
public static final int REQUEST_CODE_PERMISSION_SETTING = 2;
private Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mActivity = this;
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(this);
}

/**
* 请求单个权限
* */
private void requestPermission(String permission) {
//先判断这个权限有没有被授权
int hasPermission = ActivityCompat.checkSelfPermission(this, permission);
if (hasPermission == PackageManager.PERMISSION_GRANTED) {
ToastUtils.show(this,"This permission is granted");
}else {
//如果没有被授权,那么就要请求用户授权
//shouldShowRequestPermissionRationale()在第一次授权弹框之前或用户点击永不提醒之后 会返回false,其他情况都返回true
boolean shouldShowUI = ActivityCompat.shouldShowRequestPermissionRationale(this, permission);
SharedPreferences sp = getSharedPreferences("LOCAL_DATAS", MODE_PRIVATE);
boolean is_first_get_permission = sp.getBoolean("is_first_request_permission", true);
if (!shouldShowUI && !is_first_get_permission) {
showSnackBar();
}else {
//系统会自动弹框请求权限
ActivityCompat.requestPermissions(this, new String[]{permission}, REQUEST_CODE_PERMISSION);
sp.edit().putBoolean("is_first_request_permission",false).apply();
}
}
}

/**
* 请求权限的回调
* */
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case REQUEST_CODE_PERMISSION:
//因为只请求单个权限,所以直接获取grantResults的第一个结果就行了
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
ToastUtils.show(this,"you've granted the permission");
}else{
ToastUtils.show(this,"you've denied the permission");
}
break;
}
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

/**
* 如果用户点击了永不提醒,那么对app的使用来说是很糟糕的,我们可以通过SnackBar提示他去设置里手动打开权限
* */
private void showSnackBar() {
Snackbar.make(btn,"need permission!",Snackbar.LENGTH_LONG)
.setAction("go to setting", new View.OnClickListener() {
@Override
public void onClick(View v) {
Uri uri = Uri.fromParts("package", mActivity.getPackageName(), null);
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,uri);
mActivity.startActivityForResult(intent, REQUEST_CODE_PERMISSION_SETTING);
}
})
.show();
}

/**
* 点击按钮获取权限
* */
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn:
requestPermission(Manifest.permission.READ_PHONE_STATE);
break;

}
}
}

注释写的很详细啦,不多赘述,放在这以后要用回来拿~

有人问SnackBar为什么不是出现在屏幕底部的,请移步


EOF