目标:
当您启动该应用时, 该按钮应在5秒后显示。
顺便说一下,启动应用 - >隐藏按钮 - >等待5秒 - >显示按钮
问题:
代码不起作用,我错过了哪个部分?
的信息:
*我是新的Android,这是我尝试
return min([[dis(p,q),p,q] for p in points[:len(points)-1] for q in points[1:] if p!=q])
任何帮助将不胜感激
xml androidmanifest
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Button button2 = (Button) findViewById(R.id.btn_test);
button2.setVisibility(GONE);
new Thread(new Runnable() {
@Override
public void run() {
try{
//dummy delay for 5 second
Thread.sleep(5000);
}
catch (InterruptedException e){
e.printStackTrace();
}
runOnUiThread(new Runnable() { //resetting the visibility of the button
@Override
public void run() {
//manipulating UI components from outside of the UI Thread require a call to runOnUiThread
button2.setVisibility(VISIBLE);
}
});
}
}).start();
}
}
activity_main xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jfdimarzio.labb3">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
答案 0 :(得分:2)
好像你错过了<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-server</artifactId>
<version>3.11.0</version>
..先解决这个问题..
setContentView
请勿使用setContentView(R.layout.main_activity);
Thread
。请改用sleep
..
handler post delayed
答案 1 :(得分:0)
如此简单,您无需动作动画即可动画。只需设置持续时间,在结束动画后,监听器将显示它
buttonvVew.setVisibility(View.GONE);
buttonView.animate()
.setDuration(5000)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
buttonView.setVisibility(View.visible);
}
});
&#13;
答案 2 :(得分:0)
试试这个
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main.xml);
Button button2 = (Button) findViewById(R.id.btn_test);
button2.setVisibility(GONE);
button2.postDelayed(new Runnable() {
public void run() {
button2.setVisibility(View.VISIBLE);
}
}, 5000);
}
}