Android開發之縱向跑馬燈效果實現
阿新 • • 發佈:2019-01-04
我們看淘寶、京東等app軟體,首頁就會看到那廣告詞向上走。。。今天我給大家帶來兩種實現方式。效果圖就不上啦,直接上程式碼:
一,自定義view
1,之前經常用findViewById(),今天用另一種方式來找控制元件。在app/build.gradle的閉包中新增如下程式碼:
compile 'com.jakewharton:butterknife:7.0.1'
2,專案中會用到的佈局檔案:
1)activity_main.xml
<RelativeLayout 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"
tools:context="com.gyq.marquee_vertical.MainActivity">
<com.gyq.marquee_vertical.view.LampView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/c12"
android:minHeight="40dp" />
</RelativeLayout>
2)item_lamp_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height ="wrap_content" >
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:ellipsize="end"
android:gravity="center"
android:singleLine="true"
android:textColor="@color/c9"
android:textSize="16sp" />
<TextView
android:id="@+id/tv_info"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:ellipsize="end"
android:gravity="center_vertical"
android:singleLine="true"
android:textColor="@color/c5"
android:layout_toRightOf="@id/tv_title"
android:layout_marginLeft="10dp"
android:textSize="16sp" />
</RelativeLayout>
3)lamp_layout.xml
<?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="45dp"
android:padding="10dp"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:background="@drawable/ic_launcher"/>
<com.gyq.marquee_vertical.bean.VerticalLampView
android:id="@+id/lamp_view"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginLeft="10dp"
android:layout_gravity="center_vertical"
android:background="@color/c12"
/>
</LinearLayout>
2,邏輯程式碼
a,AutoScrollData介面
package com.gyq.marquee_vertical.bean;
/**
* ${DESC}
* author: gyq
* create at 2017/1/13 11:25
*/
public interface AutoScrollData<T> {
String getTextTitle(T data);
String getTextInfo(T data);
}
b,BaseAutoScrollTextView繼承ListView。
package com.gyq.marquee_vertical.bean;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.gyq.marquee_vertical.R;
import java.util.ArrayList;
import java.util.List;
/**
* ${DESC}
* author: gyq
* create at 2017/1/13 11:30
*/
public abstract class BaseAutoScrollTextView<T> extends ListView implements AutoScrollData<T> {
private List<T> mDataList = new ArrayList<>();
private float mSize = 16;
private int mMax ;
private int position = -1;
private int scroll_Y;
private int mScrollY;
private AutoScrollAdapter mAutoScrollAdapter = new AutoScrollAdapter();
private Context mContext;
private OnItemClickListener mOnItemClickListener;
private long mTimer = 1000;
private Handler handler = new Handler();
Runnable runnable = new Runnable() {
@Override
public void run() {
// 開啟輪播
switchItem();
handler.postDelayed(this, mTimer);
}
};
public interface OnItemClickListener {
void onItemClick(int position);
}
private void switchItem() {
if (position == -1) {
scroll_Y = 0;
}else {
scroll_Y = mScrollY;
}
smoothScrollBy(scroll_Y,2000);
setSelection(position);
position++;
}
public BaseAutoScrollTextView(Context context) {
this(context,null);
}
public BaseAutoScrollTextView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public BaseAutoScrollTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
mScrollY = dp2px(getAdertisementHeight());
init();
}
private void init(){
this.setDivider(null);
this.setDividerHeight(0);
this.setFastScrollEnabled(false);
this.setEnabled(false);
}
private int dp2px(int dipValue) {
final float scale = mContext.getResources().getDisplayMetrics().density;
return (int) (dipValue * scale + 0.5f);
}
protected abstract int getAdertisementHeight();
private class AutoScrollAdapter extends BaseAdapter {
@Override
public int getCount() {
final int count = mDataList == null ? 0 : mDataList.size();
return count > 1 ? Integer.MAX_VALUE : count;
}
@Override
public Object getItem(int position) {
return mDataList.get(position % mMax);
}
@Override
public long getItemId(int position) {
return position % mMax;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.item_lamp_layout,null);
viewHolder.mTitleView = (TextView)convertView.findViewById(R.id.tv_title);
viewHolder.mInfoView = (TextView)convertView.findViewById(R.id.tv_info);
convertView.setTag(viewHolder);
}else {
viewHolder = (ViewHolder)convertView.getTag();
}
T data = mDataList.get(position % mMax);
initItemData(position,convertView,viewHolder,data);
return convertView;
}
}
private void initItemData(final int positions, View convertView, ViewHolder viewHolder, T data) {
viewHolder.mTitleView.setLayoutParams(new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
dp2px(getAdertisementHeight())));
viewHolder.mTitleView.setTextSize(mSize);
viewHolder.mTitleView.setText(getTextTitle(data));
viewHolder.mInfoView.setTextSize(mSize);
viewHolder.mInfoView.setText(getTextInfo(data));
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// mOnItemClickListener.onItemClick(positions % mMax);
}
});
}
static class ViewHolder {
TextView mTitleView;// 標題
TextView mInfoView;// 內容
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return false;
}
public void setData(List<T> datas) {
mDataList.clear();
mDataList.addAll(datas);
mMax = mDataList == null ? 0 : mDataList.size();
this.setAdapter(mAutoScrollAdapter);
mAutoScrollAdapter.notifyDataSetChanged();
}
public void setTextSize(float _size) {
this.mSize = _size;
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.mOnItemClickListener = listener;
}
public void setTimer(long time) {
this.mTimer = time;
}
public void start() {
handler.postDelayed(runnable,1000);
}
public void stop() {
handler.removeCallbacks(runnable);
}
}
c.LampBean類
import java.io.Serializable;
/**
* ${DESC}
* author: gyq
* create at 2017/1/13 13:53
*/
public class LampBean implements Serializable {
public String title;
public String info;
}
d,
import android.content.Context;
import android.util.AttributeSet;
/**
* ${DESC}
* author: gyq
* create at 2017/1/13 13:54
*/
public class VerticalLampView extends BaseAutoScrollTextView<LampBean> {
public VerticalLampView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public VerticalLampView(Context context) {
super(context);
}
public VerticalLampView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* 這裡面的高度應該和你的xml裡設定的高度一致
* @return
*/
@Override
protected int getAdertisementHeight() {
return 40;
}
@Override
public String getTextTitle(LampBean data) {
return data.title;
}
@Override
public String getTextInfo(LampBean data) {
return data.info;
}
}
e,LampView 在這個類中,用到了第一步提到的:
第一步:
@Bind(R.id.lamp_view)
VerticalLampView lampView;
第二步:
inflate(getContext(), R.layout.lamp_layout, this);
ButterKnife.bind(this,this);
import android.content.Context;
import android.util.AttributeSet;
import android.widget.FrameLayout;
import com.gyq.marquee_vertical.R;
import com.gyq.marquee_vertical.bean.LampBean;
import com.gyq.marquee_vertical.bean.VerticalLampView;
import java.util.ArrayList;
import java.util.List;
import butterknife.Bind;
import butterknife.ButterKnife;
/**
* ${DESC}
* author: gyq
* create at 2017/1/13 13:59
*/
public class LampView extends FrameLayout {
@Bind(R.id.lamp_view)
VerticalLampView lampView;
private Context mContext;
private List<LampBean> list = new ArrayList<>();
public LampView(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
init();
}
private void init() {
setView();
}
private void setView() {
inflate(getContext(), R.layout.lamp_layout, this);
ButterKnife.bind(this,this);
initData();
initView();
}
private void initView() {
lampView.setData((ArrayList<LampBean>) list);
lampView.setTextSize(15);
lampView.setTimer(2000);
lampView.start();
}
private void initData() {
LampBean bean = new LampBean();
bean.title = "爆款";
bean.info = "踏青零食上京東,百萬零食1元秒";
list.add(bean);
bean = new LampBean();
bean.title = "公告";
bean.info = "看老劉中國行,滿129減50!";
list.add(bean);
bean = new LampBean();
bean.title = "活動";
bean.info = "高姿CC霜全渠道新品首發,領券199減50,點選檢視";
list.add(bean);
}
}
二、ViewFlipper
1,新建res/anim資料夾,然後看程式碼:
a.push_up_in.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="300"
android:fromYDelta="100%p"
android:toYDelta="0"/>
<alpha
android:duration="300"
android:fromAlpha="0.0"
android:toAlpha="1.0"/>
</set>
b.push_up_out.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:duration="300"
android:fromYDelta="0"
android:toYDelta="-100%p"/>
<alpha
android:duration="300"
android:fromAlpha="1.0"
android:toAlpha="0.0"/>
</set>
2,activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context="com.gyq.marquee_vertical.MainActivity">
<ViewFlipper
android:id="@+id/view_flipper"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:flipInterval="2000"/>
</RelativeLayout>
3,layout_item.xml,你想要的效果佈局。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/tv_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
4,MainActivity.java
package com.gyq.marquee_vertical;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.animation.AnimationUtils;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ViewFlipper;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewFlipper flipper = (ViewFlipper)findViewById(R.id.view_flipper);
for (int i = 0; i < 5;i++) {
final int y = i;
View view = getLayoutInflater().inflate(R.layout.layout_item,null,false);
//設定點選事件
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "快樂" + y, Toast.LENGTH_SHORT).show();
}
});
TextView tv = (TextView) view.findViewById(R.id.tv_content);
tv.setText("我很快樂" + i);
flipper.addView(view);
}
flipper.setInAnimation(AnimationUtils.loadAnimation(this,R.anim.push_up_in));
flipper.setOutAnimation(AnimationUtils.loadAnimation(this,R.anim.push_up_out));
flipper.startFlipping();
}
}
小結:縱向跑馬燈效果也是一種比較常見的,如果以後專案中用的著,拿去!不謝。