今天更新了一个App，打开这个App后弹出的页面是一个广告倒计时的页面，倒计时完毕后进入主界面。于是我闲着没事儿简易实现了一下这个功能，如图：
实现这个效果也很容易，在相应布局问下中添加TextView控件，控件的值就是倒计时的数字，这里我给倒计时添加了一个动画效果，项目的目录结构如下：
AndroidManifest.xml
这里我配置了WelcomeActivity界面作为广告界面，配置它为应用的第一个activity，并且隐藏其标题。
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.timewelcome" android:versionCode="1" android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="19" />
<application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" android:label="@string/app_name" >
</activity>
<activity android:name=".WelcomeActivity" android:label="@string/title_activity_welcome" android:theme="@android:style/Theme.NoTitleBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
WelcomeActivity.Java
package com.example.timewelcome;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.Window;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.TextView;
public class WelcomeActivity extends Activity {
// 声明控件对象
private TextView textView;
private int count = 5;
private Animation animation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 去除标题
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_welcome);
// 初始化控件对象
textView = (TextView) findViewById(R.id.textView);
animation = AnimationUtils.loadAnimation(this, R.anim.animation_text);
//textView.startAnimation(animation);
handler.sendEmptyMessageDelayed(0, 1000);
}
private int getCount() {
count--;
if (count == 0) {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
return count;
}
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 0) {
textView.setText(getCount()+"");
handler.sendEmptyMessageDelayed(0, 1000);
animation.reset();
textView.startAnimation(animation);
}
};
};
}
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
activity_welcome.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/image" tools:context="${relativePackage}.${activityClass}" >
<LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:orientation="horizontal" >
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:text="广告倒计时：" android:textColor="#ffffff" android:textSize="20sp" />
<TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:text="5" android:textColor="#ffffff" android:textSize="20sp" />
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:text="秒" android:textColor="#ffffff" android:textSize="20sp" />
</LinearLayout>
</FrameLayout>- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
动画的xml文件animation_text.xml存放在了res/anim目录下，实现透明度和缩放的动画。
animation_text.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<alpha android:duration="1000" android:fromAlpha="0.0" android:toAlpha="1.0" />
<scale android:duration="800" android:fromXScale="1.5" android:fromYScale="1.5" android:pivotX="50%" android:pivotY="50%" android:toXScale="1.0" android:toYScale="1.0" />
</set>- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18