Android中仿淘宝头条滚动效果,可定制布局

来源:互联网 发布:巫妖王 数据库 编辑:程序博客网 时间:2024/06/07 07:14

      本控件将实现类似淘宝头条的向上滚动的效果,同时可以自定义Animation实现更多的动画效果,支持自定义布局,我例子中的是一个Button和一个TextView,见下图。



一.SwitchView.java

import android.content.Context;import android.os.Handler;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.View;import android.widget.ViewSwitcher;public class SwitchView extends ViewSwitcher implements ViewSwitcher.ViewFactory {    private int layoutId;    private ViewBuilder viewInterface;    private boolean enable = true;    public SwitchView(Context context) {        this(context, null);    }    public SwitchView(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    public View makeView() {        return LayoutInflater.from(getContext()).inflate(layoutId, null);    }    private Handler handler = new Handler() {        public void handleMessage(android.os.Message msg) {            //加载新界面            if (enable) {                viewInterface.initView(getNextView());                setInAnimation(getContext(), R.anim.slide_in);                setOutAnimation(getContext(), R.anim.slide_out);                showNext();                handler.sendEmptyMessageDelayed(0, 2000);            }        }    };    public void initView(int layoutId, ViewBuilder viewInterface) {        this.layoutId = layoutId;        this.viewInterface = viewInterface;        //设置ViewFactory后会调用makeView()        setFactory(this);        //发送启动消息        handler.sendEmptyMessage(0);    }    public void enable(boolean enable) {        this.enable = enable;        if (enable)            handler.sendEmptyMessage(0);    }    interface ViewBuilder {        void initView(View view);    }}

二.MainActivity.java

import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity1 extends AppCompatActivity {    SwitchView sv;    Button btn;    String[] s = new String[]{"白日依山尽", "黄河入海流", "欲穷千里目", "更上一层楼",            "离离原上草", "一岁一枯荣", "野火烧不尽", "春风吹又生",            "锄禾日当午", "汗滴禾下土", "谁知盘中餐", "粒粒皆辛苦",            "鹅鹅鹅", "曲项向天歌", "白毛浮绿水", "红掌拨清波"};    int i = 0;    boolean enable;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main1);        sv = (SwitchView) findViewById(R.id.scrolltv);        btn = (Button) findViewById(R.id.btn_enable);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                sv.enable(enable);                enable = !enable;            }        });        sv.initView(R.layout.switchview, new SwitchView.ViewBuilder() {            @Override            public void initView(View view) {                TextView tv = (TextView) view.findViewById(R.id.time);                tv.setText(System.currentTimeMillis() + "");                final Button button = (Button) view.findViewById(R.id.btn);                button.setText(s[i % 10]);                button.setTag(i);                button.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View view) {                        Toast.makeText(MainActivity1.this, s[(int) button.getTag()], Toast.LENGTH_LONG).show();                    }                });                i++;                if (i == s.length) {                    i = 0;                }            }        });    }}
.activity_main1.xml
<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.zkt.demo.MainActivity">    <com.zkt.demo.SwitchView        android:id="@+id/scrolltv"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical"        android:layout_marginTop="250dp"        android:background="#0f0"        android:paddingBottom="5dp"        android:paddingTop="5dp"        app:layout_constraintHorizontal_bias="1.0"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent" />    <Button        android:id="@+id/btn_enable"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="暂停/开始" /></android.support.constraint.ConstraintLayout>

四.switvhview.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:padding="10dp">    <Button        android:id="@+id/btn"        android:layout_width="match_parent"        android:layout_height="100dp"        android:gravity="center"        android:textColor="#000"        android:textSize="20sp" />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_below="@+id/btn"        android:layout_gravity="center_horizontal"        android:id="@+id/time"        android:textSize="16sp" /></RelativeLayout>

五.slide_in.xml和slide_out.xml

1.Vertical

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">    <translate        android:duration="@android:integer/config_mediumAnimTime"        android:fromYDelta="100%p"        android:toYDelta="0" /></set>
<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">    <translate android:fromYDelta="0"        android:toYDelta="-100%p"        android:duration="@android:integer/config_mediumAnimTime"/></set>
2.Horizontal

只需要将上面的fromYDelta和toYDelta中的Y改成X即可实现横向滚动

可以看到使用的时候非常简单,只需要find之后实现initView(int layoutId,ViewBuilderbuilder方法即可,其中layoutId是要滚动的布局,viewbuilder内实现滚动布局的实例化操作。

你只需要控制position进行布局数据的更新。当界面切换时,你可以通过enable(boolean enable)控制滚动的暂停/播放。

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