Android6.0之后的权限检查及申请

以下这些权限在Android6. 0之后，都需要动态申请：

我们以申请WRITE_EXTERNAL_STORAGE权限为例

1、在AndroidManifest.xml中注册权限

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

private static final  int PERMISSION_REQUEST_CODE = 1;
    private void checkMyAppPermission() {
        // android6.0 API 23后需要动态申请权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            int checkRs = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
            if (checkRs == PackageManager.PERMISSION_DENIED) {
                // 没有权限要去申请
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
            }
        }
    }      

// requestCode是requestPermissions(String[], int)传进来的int值
    // permissions是申请的权限
    // grantResults与permissions一一对应的申请结果，它的取值只能是PackageManager.PERMISSION_GRANTED或PackageManager.PERMISSION_DENIED
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (PERMISSION_REQUEST_CODE == requestCode) {
            for (int i = 0; i < permissions.length; i++) {
                if(Manifest.permission.WRITE_EXTERNAL_STORAGE.equals(permissions[i]) &&
                PackageManager.PERMISSION_GRANTED == grantResults[i]) {
                    Toast.makeText(MainActivity.this,"您已获得写SD卡的权限",Toast.LENGTH_LONG).show();
                }
            }
        }
    }