我正在开发一个壁纸应用，我在其中以ImageView显示图像作为启动画面。
现在我想将ImageView图像作为启动画面闪烁。
这是我的启动画面代码：
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.widget.ImageView;
import android.widget.Toast;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.usd.amazingwallpapershd.app.AppConst;
import com.usd.amazingwallpapershd.app.AppController;
import com.usd.amazingwallpapershd.picasa.model.Category;
@SuppressLint("NewApi")
public class SplashActivity extends Activity {
private static final String TAG = SplashActivity.class.getSimpleName();
private static final String TAG_FEED = "feed", TAG_ENTRY = "entry",
TAG_GPHOTO_ID = "gphoto$id", TAG_T = "$t",
TAG_ALBUM_TITLE = "title";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
getActionBar().hide();
setContentView(R.layout.activity_splash);
// //splash images array
// Randomise a background
// int[] yourListOfImages = { R.drawable.splash_8, R.drawable.splash_8
// };
int[] yourListOfImages = { R.drawable.splash_1, R.drawable.splash_2,
R.drawable.splash_3, R.drawable.splash_4 };
Random random = new Random(System.currentTimeMillis());
int posOfImage = random.nextInt(yourListOfImages.length - 1);
ImageView imageView = (ImageView) findViewById(R.id.splash_imageview);
imageView.setBackgroundResource(yourListOfImages[posOfImage]);
// //
// //
// Picasa request to get list of albums
String url = AppConst.URL_PICASA_ALBUMS
.replace("_PICASA_USER_", AppController.getInstance()
.getPrefManger().getGoogleUserName());
Log.d(TAG, "Albums request url: " + url);
// Preparing volley's json object request
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET, url,
null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d(TAG, "Albums Response: " + response.toString());
List<Category> albums = new ArrayList<Category>();
try {
// Parsing the json response
JSONArray entry = response.getJSONObject(TAG_FEED)
.getJSONArray(TAG_ENTRY);
// loop through albums nodes and add them to album
// list
for (int i = 0; i < entry.length(); i++) {
JSONObject albumObj = (JSONObject) entry.get(i);
// album id
String albumId = albumObj.getJSONObject(
TAG_GPHOTO_ID).getString(TAG_T);
// album title
String albumTitle = albumObj.getJSONObject(
TAG_ALBUM_TITLE).getString(TAG_T);
Category album = new Category();
album.setId(albumId);
album.setTitle(albumTitle);
// add album to list
albums.add(album);
Log.d(TAG, "Album Id: " + albumId
+ ", Album Title: " + albumTitle);
}
// Store albums in shared pref
AppController.getInstance().getPrefManger()
.storeCategories(albums);
// String the main activity
Intent intent = new Intent(getApplicationContext(),
MainActivity.class);
startActivity(intent);
// closing spalsh activity
finish();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
getString(R.string.msg_unknown_error),
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@SuppressWarnings("deprecation")
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Volley Error: " + error.getMessage());
// show error toast
Toast.makeText(getApplicationContext(),
getString(R.string.splash_error),
Toast.LENGTH_LONG).show();
// Unable to fetch albums
// check for existing Albums data in Shared Preferences
if (AppController.getInstance().getPrefManger()
.getCategories() != null
&& AppController.getInstance().getPrefManger()
.getCategories().size() > 0) {
// String the main activity
Intent intent = new Intent(getApplicationContext(),
MainActivity.class);
startActivity(intent);
// closing spalsh activity
finish();
} else {
// Albums data not present in the shared preferences
// Launch settings activity, so that user can modify
// the settings
// Intent i = new Intent(SplashActivity.this,
// SettingsActivity.class);
// // clear all the activities
// i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
// | Intent.FLAG_ACTIVITY_CLEAR_TASK);
// startActivity(i);
AlertDialog alertDialog = new AlertDialog.Builder(
SplashActivity.this).create();
alertDialog
.setMessage("Please connect to the internet and try again");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
}
}
});
// disable the cache for this request, so that it always fetches updated
// json
jsonObjReq.setShouldCache(false);
// Making the request
AppController.getInstance().addToRequestQueue(jsonObjReq);
}
}
，这是BlinkActivity代码：
import android.app.Activity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
public class BlinkActivity extends Activity implements AnimationListener {
ImageView img;
// Animation
Animation animBlink;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
img = (ImageView) findViewById(R.id.splash_imageview);
// load the animation
animBlink = AnimationUtils.loadAnimation(getApplicationContext(),
R.anim.blink);
// set animation listener
animBlink.setAnimationListener(this);
// start the animation
img.startAnimation(animBlink);
}
@Override
public void onAnimationEnd(Animation animation) {
// Take any action after completing the animation
// check for blink animation
if (animation == animBlink) {
}
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationStart(Animation animation) {
}
}
但是我不明白如何将两者结合起来才能使其发挥作用？
答案 0 :(得分：34)
以下代码段将使ImageView闪烁。将ImageView的背景设置为透明。
Animation animation = new AlphaAnimation(1, 0); //to change visibility from visible to invisible
animation.setDuration(1000); //1 second duration for each animation cycle
animation.setInterpolator(new LinearInterpolator());
animation.setRepeatCount(Animation.INFINITE); //repeating indefinitely
animation.setRepeatMode(Animation.REVERSE); //animation will start from end point once ended.
imageButton.startAnimation(animation); //to start animation
答案 1 :(得分：11)
**试试这段代码**
image = (ImageView) findViewById(R.id.image);
Animation animation = new AlphaAnimation((float) 0.5, 0); // Change alpha from fully visible to invisible
animation.setDuration(500); // duration - half a second
animation.setInterpolator(new LinearInterpolator()); // do not alter
// animation
// rate
animation.setRepeatCount(Animation.INFINITE); // Repeat animation
// infinitely
animation.setRepeatMode(Animation.REVERSE); // Reverse animation at the
// end so the button will
// fade back in
image.startAnimation(animation);
答案 2 :(得分：0)
如果您不想使ImageView的背景闪烁（仅闪烁源图像），或者您只是不想自己编写任何代码 - 这正是我试图避免的 - 那么你我们必须创建一个自定义视图并在内部执行 当然，有一个父FrameLayout的解决方法，但是当没有实际需要时，不要创建更多的层次结构。 :)
无论如何，我实际上写了一个Blinker View，因为我需要这样的行为，你可以从这里自由使用它：https://github.com/milosmns/blinking-image-view
快乐的编码！
答案 3 :(得分：0)
@Component({
selector: 'app-custom-paginator',
template: (<any>MatPaginator).__annotations__[0]['template'],
})
export class CustomPaginator extends MatPaginator {
customMethod(): number {
return 1
}
}