Android 动态添加权限
<h2>问题描述</h2>
<p>公司的 app 要链接BLE蓝牙设备,最近发现在 6.0 系统,startLeScan(mLeScanCallback);回调不触发.查资料发现 >6.0 需要一个模糊位置权限才能使用蓝牙,至于为什么蓝牙需要位置权限,我也很意外.</p>
<h2>解决思路</h2>
<p>1.1 清单加入位置权限(有可能清单中已经具备了)</p>
<pre><code>&lt;uses-permission android:name=&quot;android.permission.ACCESS_COARSE_LOCATION&quot; /&gt;</code></pre>
<p>1.2 动态请求权限(关键)</p>
<pre><code class="language-java"> private static final int REQUEST_COARSE_LOCATION = 0;
private void mayRequestLocation() {
if (Build.VERSION.SDK_INT &gt;= 23) {
int checkCallPhonePermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION);
if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
//判断是否需要 向用户解释,为什么要申请该权限
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION))
Toast.makeText(this, &quot;动态请求权限&quot;, Toast.LENGTH_LONG).show();
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_COARSE_LOCATION);
return;
} else {
}
} else {
}
}
//系统方法,从requestPermissions()方法回调结果
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
//确保是我们的请求
if (requestCode == REQUEST_COARSE_LOCATION) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, &quot;权限被授予&quot;, Toast.LENGTH_SHORT).show();
} else if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, &quot;权限被拒绝&quot;, Toast.LENGTH_SHORT).show();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}</code></pre>