實現一個垂直跑馬燈的效果（垂直公告）
阿新 • • 發佈：2019-01-05
實現一個簡單的跑馬燈的效果，類似於App裡面的通知：恭喜XXX獲得了什麼什麼的效果。
首先先匯入兩個工具類
import android.app.Activity;
import android.content.Context;
import android.util.DisplayMetrics;
/**
* dp、sp 轉換為 px 的工具類
*
* Created by sunfusheng on 16/5/31.
*/
public class DisplayUtil {
// 將px值轉換為dip或dp值，保證尺寸大小不變
public static int 還有
import android.content.Context;
import android.content.res.TypedArray;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.TextView;
import android.widget.ViewFlipper;
import java.util.ArrayList;
import java.util.List;
/**
* Created by sunfusheng on 16/5/31.
*/
public class MarqueeView extends ViewFlipper {
private Context mContext;
private List<? extends CharSequence> notices;
private boolean isSetAnimDuration = false;
private OnItemClickListener onItemClickListener;
private int interval = 2000;
private int animDuration = 500;
private int textSize = 14;
private int textColor = 0xffffffff;
private boolean singleLine = false;
private int gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;
private static final int TEXT_GRAVITY_LEFT = 0, TEXT_GRAVITY_CENTER = 1, TEXT_GRAVITY_RIGHT = 2;
public MarqueeView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
this.mContext = context;
if (notices == null) {
notices = new ArrayList<>();
}
TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.MarqueeViewStyle, defStyleAttr, 0);
interval = typedArray.getInteger(R.styleable.MarqueeViewStyle_mvInterval, interval);
isSetAnimDuration = typedArray.hasValue(R.styleable.MarqueeViewStyle_mvAnimDuration);
singleLine = typedArray.getBoolean(R.styleable.MarqueeViewStyle_mvSingleLine, false);
animDuration = typedArray.getInteger(R.styleable.MarqueeViewStyle_mvAnimDuration, animDuration);
if (typedArray.hasValue(R.styleable.MarqueeViewStyle_mvTextSize)) {
textSize = (int) typedArray.getDimension(R.styleable.MarqueeViewStyle_mvTextSize, textSize);
textSize = DisplayUtil.px2sp(mContext, textSize);
}
textColor = typedArray.getColor(R.styleable.MarqueeViewStyle_mvTextColor, textColor);
int gravityType = typedArray.getInt(R.styleable.MarqueeViewStyle_mvGravity, TEXT_GRAVITY_LEFT);
switch (gravityType) {
case TEXT_GRAVITY_CENTER:
gravity = Gravity.CENTER;
break;
case TEXT_GRAVITY_RIGHT:
gravity = Gravity.RIGHT | Gravity.CENTER_VERTICAL;
break;
}
typedArray.recycle();
setFlipInterval(interval);
}
// 根據公告字串啟動輪播
public void startWithText(final String notice) {
if (TextUtils.isEmpty(notice)) return;
getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
getViewTreeObserver().removeGlobalOnLayoutListener(this);
startWithFixedWidth(notice, getWidth());
}
});
}
// 根據公告字串列表啟動輪播
public void startWithList(List<? extends CharSequence> notices) {
setNotices(notices);
start();
}
// 根據寬度和公告字串啟動輪播
private void startWithFixedWidth(String notice, int width) {
int noticeLength = notice.length();
int dpW = DisplayUtil.px2dip(mContext, width);
int limit = dpW / textSize;
if (dpW == 0) {
throw new RuntimeException("Please set MarqueeView width !");
}
List list = new ArrayList();
if (noticeLength <= limit) {
list.add(notice);
} else {
int size = noticeLength / limit + (noticeLength % limit != 0 ? 1 : 0);
for (int i = 0; i < size; i++) {
int startIndex = i * limit;
int endIndex = ((i + 1) * limit >= noticeLength ? noticeLength : (i + 1) * limit);
list.add(notice.substring(startIndex, endIndex));
}
}
notices.addAll(list);
start();
}
// 啟動輪播
public boolean start() {
if (notices == null || notices.size() == 0) return false;
removeAllViews();
resetAnimation();
for (int i = 0; i < notices.size(); i++) {
final TextView textView = createTextView(notices.get(i), i);
final int finalI = i;
textView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListener != null) {
onItemClickListener.onItemClick(finalI, textView);
}
}
});
addView(textView);
}
if (notices.size() > 1) {
startFlipping();
} else {
stopFlipping();
}
return true;
}
private void resetAnimation() {
clearAnimation();
Animation animIn = AnimationUtils.loadAnimation(mContext, R.anim.anim_marquee_in);
if (isSetAnimDuration) animIn.setDuration(animDuration);
setInAnimation(animIn);
Animation animOut = AnimationUtils.loadAnimation(mContext, R.anim.anim_marquee_out);
if (isSetAnimDuration) animOut.setDuration(animDuration);
setOutAnimation(animOut);
}
// 建立ViewFlipper下的TextView
private TextView createTextView(CharSequence text, int position) {
TextView tv = new TextView(mContext);
tv.setGravity(gravity);
tv.setText(text);
tv.setTextColor(textColor);
tv.setTextSize(textSize);
tv.setSingleLine(singleLine);
tv.setTag(position);
return tv;
}
public int getPosition() {
return (int) getCurrentView().getTag();
}
public List<? extends CharSequence> getNotices() {
return notices;
}
public void setNotices(List<? extends CharSequence> notices) {
this.notices = notices;
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
public interface OnItemClickListener {
void onItemClick(int position, TextView textView);
}
}
然後在佈局檔案裡面
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.cangyigou.marqueeviewdemo.MainActivity">
<com.example.cangyigou.marqueeviewdemo.MarqueeView
android:id="@+id/marqueeView"
android:layout_width="match_parent"
android:layout_height="30dp"
app:mvAnimDuration="1000"
app:mvInterval="3000"
app:mvTextColor="#00f"
app:mvTextSize="14sp"
app:mvSingleLine="true"/>
</RelativeLayout>
最後是MainActivity裡面的內容
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MarqueeView marqueeView = (MarqueeView) findViewById(R.id.marqueeView);
final List<String> info = new ArrayList<>();
info.add("恭喜172*****824的代理6月13號成交6200元，已完成簽收");
info.add("恭喜130*****060的代理6月13號成交35000元，已完成簽收");
info.add("恭喜182*****244的代理6月13號成交19000元，已完成簽收");
info.add("恭喜152*****496的代理6月13號成交800元，已完成簽收");
info.add("恭喜180*****664的代理6月13號成交9900元，已完成簽收");
info.add("恭喜131*****527的代理6月13號成交7600元，已完成簽收");
marqueeView.startWithList(info);
// String notice = "心中有陽光，腳底有力量！心中有陽光，腳底有力量！心中有陽光，腳底有力量！";
// marqueeView.startWithText(notice);
marqueeView.setOnItemClickListener(new MarqueeView.OnItemClickListener() {
@Override
public void onItemClick(int position, TextView textView) {
Toast.makeText(getApplicationContext(), String.valueOf(marqueeView.getPosition()) + ". " + textView.getText(), Toast.LENGTH_SHORT).show();
}
});
}
}裡面集合裡新增的條目就是要展示的資料，我們也可以將網上的資料給解析展示出來
