Android 6.0后权限的申请

前言

Android 6.0 后，非系统应用权限获取收紧，应用需要动态的申请权限。

你除了AndroidManifest.xml中定义需要的权限，还需要在Java代码中再需要对应权限前提示用户授权。

正文

第一步

AndroidManifest.xml

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

第二步

定义需要授权的权限

    //申请需要的所有权限
    private final String REQUEST_MANIFEST_PERMISSION[] = new String[]{
            Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE
    };

PS：REQUEST_MANIFEST_PERMISSION中定义的需要跟AndroidManifest.xml配对，要不然无法申请到权限。

申请权限授权

    public void requestPerssion(Activity activity, int permission_request_code) {
        if (null == activity) {
            Log.d(TAG, "requestPerssion null : ");
            return;
        }
        // Android 6.0后非系统应用需要申请权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            ActivityCompat.requestPermissions(activity, REQUEST_MANIFEST_PERMISSION, permission_request_code);
        }

        return;
    }

重写权限状态的回调

    /**
     * @param requestCode  请求时的request code
     * @param permissions  返回的权限的数组
     * @param grantResults 返回对应权限申请状态的数组[-1 申请失败，0申请成功]
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case PERMISSION_REQUEST_CODE:
                if (grantResults != null && permissions != null) {
                    for (int i = 0; i < grantResults.length; i++) {
                        Log.d(TAG, "grantResults[" + i + "]:" + grantResults[i]);
                        Log.d(TAG, "permissions[" + i + "]:" + permissions[i]);
                    }
                }
                break;
        }
    }

权限申请成功状态

    /**
     * Permission check result: this is returned by {@link #checkPermission}
     * if the permission has been granted to the given package.
     */
    public static final int PERMISSION_GRANTED = 0;

    /**
     * Permission check result: this is returned by {@link #checkPermission}
     * if the permission has not been granted to the given package.
     */
    public static final int PERMISSION_DENIED = -1;

参考文章

1. 《Android RuntimePermissions运行时权限：批量权限申请》