1
目標：在操作欄中有一個連接圖標。 OnClick，它應該嘗試在後臺連接。在嘗試連接時，應該播放連接動畫。然後它應該切換回「not_connected」或「connected」drawable，取決於成功或失敗。Android：動作欄中的動畫不支持異步任務
問題：如果我調用自定義操作提供程序的onClick方法內的代碼，它可以很好地工作（請參見切換它的註釋部分）。當相同的確切代碼位於AsyncTask的onPreExecute內部時，即使我將引用傳遞給ImageView，它也不會播放（它停留在第一幀）。
我的設置：要在操作欄中執行幀動畫，您必須使用自定義操作提供程序（請參閱animationDrawable is not playing in Actionbar?）。所以，我有一個自定義佈局，一個自定義操作提供程序，它可以擴展它並設置點擊式方法。我的連接功能位於AsyncTask中，因此它將異步連接。
任何想法？
menu.xml文件
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@+id/connect"
android:showAsAction="always"
android:title="@string/btn_connect"
android:actionProviderClass="com.****.ConnectIconActionProvider"
/>
</menu>
佈局/ connecting_animation.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ivConnecting"
style="@android:style/Widget.ActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_not_connected" />
動畫/ connectinganimation.xml
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false">
<item android:drawable="@drawable/ic_connecting1" android:duration="300" />
<item android:drawable="@drawable/ic_connecting2" android:duration="300" />
<item android:drawable="@drawable/ic_connecting3" android:duration="300" />
</animation-list>
ConnectIconActionProvider.java
public class ConnectIconActionProvider extends ActionProvider {
private Context context;
private ImageView button;
// boolean toggle = false;
private AnimationDrawable animationDrawable;
public ConnectIconActionProvider(Context context) {
super(context);
this.context = context;
}
@Override
public View onCreateActionView(MenuItem forItem) {
// Inflate the action view to be shown on the action bar.
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.connecting_animation, null);
button = (ImageView) view.findViewById(R.id.ivConnecting);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MyClass.toggleConnectionToDevice(button);
// if (toggle) {
// button.setImageResource(R.anim.connectinganimation);
// animationDrawable = (AnimationDrawable) button.getDrawable();
// animationDrawable.start();
// } else {
// button.setImageResource(R.drawable.ic_not_connected);
// if (animationDrawable != null) {
// animationDrawable.stop();
// }
// }
// toggle ^= true;
}
});
return view;
}
MyClass.toggleConnectionToDevice
public void toggleConnectionToDevice(ImageView iv) {
if (deviceConnected) {
(new DisconnectProgressBar(this, iv)).execute();
} else {
(new ConnectProgressBar(this, iv)).execute();
}
}
ConnectProgressBar.java
public class ConnectProgressBar extends AsyncTask<Void, Void, Void> {
private final MainActivity activity;
private AnimationDrawable animationDrawable;
private ImageView iv;
private Handler handler = new Handler(Looper.getMainLooper());
public ConnectProgressBar(final MainActivity activity, final ImageView iv) {
this.activity = activity;
this.iv = iv;
}
@Override
protected void onPreExecute() {
if (iv != null) {
iv.setImageResource(R.anim.connectinganimation);
animationDrawable = (AnimationDrawable) iv.getDrawable();
animationDrawable.start();
}
}
@Override
protected Void doInBackground(final Void... params) {
// Connect to Car
handler.post(new Runnable() {
public void run() {
activity.isCurrentlyConnecting = true;
activity.connect();
}
});
return null;
}
@Override
protected void onPostExecute(final Void result) {
if (activity.deviceConnected) {
// Show Connected Icon
if (animationDrawable != null) {
animationDrawable.stop();
}
if (iv != null) {
iv.setImageResource(R.drawable.ic_connected);
}
} else {
Toast.makeText(activity, "Connect failed!", Toast.LENGTH_LONG).show();
// Show Disconnected Icon
if (animationDrawable != null) {
animationDrawable.stop();
}
if (iv != null) {
iv.setImageResource(R.drawable.ic_not_connected);
}
}
}
}