Android

个人Android学习总结


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 &gt;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>&amp;lt;uses-permission android:name=&amp;quot;android.permission.ACCESS_COARSE_LOCATION&amp;quot; /&amp;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 &amp;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, &amp;quot;动态请求权限&amp;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, &amp;quot;权限被授予&amp;quot;, Toast.LENGTH_SHORT).show(); } else if (grantResults[0] != PackageManager.PERMISSION_GRANTED) { Toast.makeText(this, &amp;quot;权限被拒绝&amp;quot;, Toast.LENGTH_SHORT).show(); } } else { super.onRequestPermissionsResult(requestCode, permissions, grantResults); } }</code></pre>

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