Android6.0之後的權限檢查及申請

以下這些權限在Android6. 0之後，都需要動态申請：

我們以申請WRITE_EXTERNAL_STORAGE權限為例

1、在AndroidManifest.xml中注冊權限

<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後需要動态申請權限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            int checkRs = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
            if (checkRs == PackageManager.PERMISSION_DENIED) {
                // 沒有權限要去申請
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
            }
        }
    }      

// requestCode是requestPermissions(String[], int)傳進來的int值
    // permissions是申請的權限
    // grantResults與permissions一一對應的申請結果，它的取值隻能是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,"您已獲得寫SD卡的權限",Toast.LENGTH_LONG).show();
                }
            }
        }
    }