我正在尝试为我的应用程序使用启动屏幕。 我想在启动画面中显示倒数计时器。 到目前为止，我能够实现启动屏幕的工作，但是不知道如何显示倒数计时器。我创建了倒计时计时器的布局。我希望启动画面停留5个小时，然后进行下一个活动。
Splashactivity.java
public class splash_screen extends AppCompatActivity {
private float imageAplha = 1f;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash_screen);
//splashScreenUseTimer(5000);
splashScreenUseAsyncTask();
}
// Show splash screen until network load data complete.
private void splashScreenUseAsyncTask()
{
// Create a AsyncTask object.
final RetrieveDateTask retrieveDateTask = new RetrieveDateTask();
retrieveDateTask.execute("", "", "");
// Get splash image view object.
final ImageView splashImageView = (ImageView) findViewById(R.id.logo_id);
// Create a count down timer object.It will count down every 0.1 seconds and last for milliSeconds milliseconds..
CountDownTimer countDownTimer = new CountDownTimer(5000, 100) {
@Override
public void onTick(long l) {
// Reduce the splash screen background image's alpha value for each count down.
splashImageView.setAlpha(imageAplha);
imageAplha -= 0.1;
if(imageAplha <= 0)
{
imageAplha = 1;
}
}
@Override
public void onFinish() {
// When count down complete, set the image to invisible.
imageAplha = 0;
splashImageView.setAlpha(imageAplha);
// If AsyncTask is not complete, restart the counter to count again.
if(!retrieveDateTask.isAsyncTaskComplete()) {
this.start();
}
}
};
// Start the count down timer.
countDownTimer.start();
}
// This is the async task class that get data from network.
private class RetrieveDateTask extends AsyncTask<String, String, String>{
// Indicate whether AsyncTask complete or not.
private boolean asyncTaskComplete = false;
public boolean isAsyncTaskComplete() {
return asyncTaskComplete;
}
public void setAsyncTaskComplete(boolean asyncTaskComplete) {
this.asyncTaskComplete = asyncTaskComplete;
}
// This method will be called before AsyncTask run.
@Override
protected void onPreExecute() {
this.asyncTaskComplete = false;
}
// This method will be called when AsyncTask run.
@Override
protected String doInBackground(String... strings) {
try {
// Simulate a network operation which will last for 10 seconds.
Thread currTread = Thread.currentThread();
for (int i = 0; i < 10; i++) {
currTread.sleep(1000);
}
}catch(Exception ex)
{
ex.printStackTrace();
}finally {
return null;
}
}
// This method will be called after AsyncTask run.
@Override
protected void onPostExecute(String s) {
// Start SplashScreenMainActivity.
Intent mainIntent = new Intent(splash_screen.this,
MainActivity.class);
splash_screen.this.startActivity(mainIntent);
// Close SplashScreenActivity.
splash_screen.this.finish();
this.asyncTaskComplete = true;
}
}
}
布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0"
android:background="@color/White"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<ImageView
android:id="@+id/logo_id"
android:layout_width="350dp"
android:layout_height="match_parent"
app:srcCompat="@drawable/ts_logo"
android:layout_gravity="center"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:orientation="vertical">
<LinearLayout
android:id="@+id/linear_layout_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/black"
android:visibility="visible">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_hour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_hour_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Hour"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_minute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_minute_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Minute"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_second_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Second"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
答案 0 :(得分：2)
@contact虚拟对象我稍加修改就编辑了@Dev代码。尝试这个。根据您的动画要求增加和减小imageAlpha大小。
private float imageAplha = 1f;
private boolean imageStatus = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
splashScreenUseAsyncTask();
}
// Show splash screen until network load data complete.
private void splashScreenUseAsyncTask()
{
// Create a AsyncTask object.
final RetrieveDateTask retrieveDateTask = new RetrieveDateTask();
retrieveDateTask.execute("", "", "");
// Get splash image view object.
final ImageView splashImageView = (ImageView) findViewById(R.id.logo_id);
final TextView tv_hour = (TextView) findViewById(R.id.tv_hour);
final TextView tv_minute = (TextView) findViewById(R.id.tv_minute);
final TextView tv_second = (TextView) findViewById(R.id.tv_second);
// Create a count down timer object.It will count down every 0.1 seconds and last for milliSeconds milliseconds..
final int time= 3600000*5;
CountDownTimer countDownTimer = new CountDownTimer(time, 1000) {
@Override
public void onTick(long l) {
long Days = l / (24 * 60 * 60 * 1000);
long Hours = l / (60 * 60 * 1000) % 24;
long Minutes = l / (60 * 1000) % 60;
long Seconds = l / 1000 % 60;
//
// tv_days.setText(String.format("%02d", Days));
tv_hour.setText(String.format("%02d", Hours));
tv_minute.setText(String.format("%02d", Minutes));
tv_second.setText(String.format("%02d", Seconds));
splashImageView.setAlpha(imageAplha);
if(imageStatus){
imageAplha += 1;
if(imageAplha >= 1)
{
// imageAplha-= 0.5;
imageStatus = false;
}
}else{
imageAplha -= 1;
if(imageAplha <= 0)
{
imageStatus = true;
}
}
}
@Override
public void onFinish() {
// When count down complete, set the image to invisible.
imageAplha = 0;
splashImageView.setAlpha(imageAplha);
// If AsyncTask is not complete, restart the counter to count again.
if(!retrieveDateTask.isAsyncTaskComplete()) {
this.start();
}
}
};
// Start the count down timer.
countDownTimer.start();
}
// This is the async task class that get data from network.
private class RetrieveDateTask extends AsyncTask<String, String, String> {
// Indicate whether AsyncTask complete or not.
private boolean asyncTaskComplete = false;
public boolean isAsyncTaskComplete() {
return asyncTaskComplete;
}
public void setAsyncTaskComplete(boolean asyncTaskComplete) {
this.asyncTaskComplete = asyncTaskComplete;
}
// This method will be called before AsyncTask run.
@Override
protected void onPreExecute() {
this.asyncTaskComplete = false;
}
// This method will be called when AsyncTask run.
@Override
protected String doInBackground(String... strings) {
try {
// Simulate a network operation which will last for 10 seconds.
Thread currTread = Thread.currentThread();
for (int i = 0; i < 18000000; i++) {
currTread.sleep(1000);
}
}catch(Exception ex)
{
ex.printStackTrace();
}finally {
return null;
}
}
// This method will be called after AsyncTask run.
@Override
protected void onPostExecute(String s) {
// Start SplashScreenMainActivity.
Intent mainIntent = new Intent(splash_screen .this,
MainActvity.class);
splash_screen.this.startActivity(mainIntent);
// Close SplashScreenActivity.
splash_screen.this.finish();
this.asyncTaskComplete = true;
}
}
}
答案 1 :(得分：1)
@contact虚拟人，我已经编辑了您的代码，尝试使用
// Show splash screen until network load data complete.
private void splashScreenUseAsyncTask()
{
// Create a AsyncTask object.
final RetrieveDateTask retrieveDateTask = new RetrieveDateTask();
retrieveDateTask.execute("", "", "");
// Get splash image view object.
final ImageView splashImageView = (ImageView) findViewById(R.id.logo_id);
//for 5 Hours
final int time= 3600000*5;
CountDownTimer countDownTimer = new CountDownTimer(time, 1000) {
@Override
public void onTick(long l) {
long Days = l / (24 * 60 * 60 * 1000);
long Hours = l / (60 * 60 * 1000) % 24;
long Minutes = l / (60 * 1000) % 60;
long Seconds = l / 1000 % 60;
//
tv_days.setText(String.format("%02d", Days));
tv_hour.setText(String.format("%02d", Hours));
tv_minute.setText(String.format("%02d", Minutes));
tv_second.setText(String.format("%02d", Seconds));
splashImageView.setAlpha(imageAplha);
imageAplha -= 0.1;
if(imageAplha <= 0)
{
imageAplha = 1;
}
}
@Override
public void onFinish() {
// When count down complete, set the image to invisible.
imageAplha = 0;
splashImageView.setAlpha(imageAplha);
// If AsyncTask is not complete, restart the counter to count again.
if(!retrieveDateTask.isAsyncTaskComplete()) {
this.start();
}
}
};
// Start the count down timer.
countDownTimer.start();
}