Question

在我的MainActivity's xml文件中，activity_main.xml我有一个显示预订列表的FrameLayout：

    <ProgressBar android:id="@+id/login_progress" style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_marginBottom="8dp" android:layout_marginTop="16dp"
        android:visibility="gone"
        android:layout_gravity="center"/>

    <FrameLayout android:id="@+id/home_page_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

当用户想通过点击消除一个预约时，必须更新列表，因此我使用这种方法对网络进行呼叫：

public void cancelReservation(ReservationResponse rR){
    if (mNetwork != null) {return;}
    if (isNetworkAvailable()) {
        showProgress(true);
        mNetwork = new NetworkTask(this, "cancel_reservation", rR);
        mNetwork.execute((Void) null);
    }else{
        // display error
        Log.d("LOG_TAG", "No network available!");
        Toast.makeText(this, R.string.no_network_dialog ,Toast.LENGTH_LONG).show();
    }
}

更新AppEngine个预订，并将更新的列表返回Activity。在执行AsyncTask之前，我调用方法showProgress，开始这个简单的动画：

enter image description here

该方法具有恒定的持续时间，在此期间隐藏FrameLayout以支持ProgressBar;然后在ProgressBar onAnimationEnd方法中恢复FrameLayout并将动画设置为View.GONE，最后显示更新的预订列表：

@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
public void showProgress(final boolean showProgr) {
    final FrameLayout home_scroll = (FrameLayout) findViewById(R.id.home_page_frame);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
        mProgressView.destroyDrawingCache();

        int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
        home_scroll.setVisibility(showProgr ? View.GONE : View.VISIBLE);
        mProgressView.setVisibility(showProgr ? View.VISIBLE : View.GONE);
        mProgressView.animate().setDuration(shortAnimTime*9).alpha(
                showProgr ? 0 : 1).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(showProgr ? View.GONE : View.VISIBLE);
                    home_scroll.setVisibility(showProgr ? View.VISIBLE : View.GONE);
                }
        });

    } else {
        home_scroll.setVisibility(showProgr ? View.GONE : View.VISIBLE);
    }
}

我古怪的问题是，当我第一次取消预约时，会显示动画，从第二次开始，每次取消预约时动画都不会出现。怎么样？

我已尝试过调用此方法：

        mProgressView.destroyDrawingCache();

但它没有用......

Answer 1

我通过修改我使用方法@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2) public void showProgress(final boolean showProgr) { // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow // for very easy animations. If available, use these APIs to fade-in // the progress spinner. final FrameLayout home_scroll = (FrameLayout) findViewById(R.id.home_page_frame); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) { mProgressView.refreshDrawableState();//setVisibility(View.GONE); if(showProgr) { home_scroll.setVisibility(showProgr ? View.GONE : View.VISIBLE); mProgressView.setVisibility(showProgr ? View.VISIBLE : View.GONE); mProgressView.animate(); }else{ mProgressView.setVisibility(showProgr ? View.VISIBLE : View.GONE); mProgressView.invalidate(); mProgressView.clearAnimation(); mProgressView.setActivated(false); home_scroll.setVisibility(showProgr ? View.GONE : View.VISIBLE); } } else { //TODO debug <= HONEYCOMB home_scroll.setVisibility(showProgr ? View.GONE : View.VISIBLE); } }的方式解决了这个问题。

showProgress

在我使用该方法之前，通过设置一个简短的动画并等待它自己完成。 Insead，通过不设置计时器并调用showProgress(true)方法两次，首先是动画必须以showProgress(false)开头，第二次是当它必须以$serverName = "xxxx\SQLEXPRESS"; //serverName\instanceName $connectionInfo = array( "Database"=>"xxxx", "UID"=>"xxx", "PWD"=>"xxxx" , "CharacterSet" => "UTF-8"); $con = sqlsrv_connect( $serverName, $connectionInfo); if($con) { echo "Connection established"; } else{ echo "Connection could not be established."; die( print_r( sqlsrv_errors(), true)); } $query = "SET IDENTITY_INSERT dbo.xxx ON "; $query = "INSERT INTO dbo.xxx([Id],[IdFirma], [VrstaDokumenta], [BrojDokumenta], [BrojDokumentaKroz], [DatumDokumenta], [IdKupac], [VrstaCijene], [IdKorisnik], [NacinPlacanja], [DatumZadnjeAkcije], [Status], [StatusArhive], [StatusIzmjene], [StatusStampe], [VrstaFakture]) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"; $params = array($id,$IdFirma,$VrstaDokumenta,$BrojDokumenta, $BrojDokumentaKroz, $DatumDokumenta, $IdKupac, $VrstaCijene, $IdKorisnik, $NacinPlacanja, $DatumZadnjeAkcije, $Status, $StatusArhive, $StatusIzmjene, $StatusStampe, $VrstaFakture); /* Prepare and execute the statement. */ $stmt = sqlsrv_query( $con, $query, $params); if( $stmt === false ) { die( print_r( sqlsrv_errors(), true)); }结束时，然后全部很好地工作。

ProgressBar动画只显示一次

1 个答案: