Android自定義TextBanner實現自動滾動
阿新 • • 發佈:2020-07-24
本文例項為大家分享了Android自定義TextBanner實現自動滾動的具體程式碼,供大家參考,具體內容如下
1、TextBanner
package com.example.myapplication.customview; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.ViewFlipper; import com.example.myapplication.R; import java.util.ArrayList; import java.util.List; public class TextBanner extends ViewGroup { private List<String> mData = new ArrayList<>(); private ViewFlipper viewFlipper; private int parentWidthSpec; public TextBanner(Context context) { super(context); } public TextBanner(Context context,AttributeSet attrs) { super(context,attrs); } public TextBanner(Context context,AttributeSet attrs,int defStyleAttr) { super(context,attrs,defStyleAttr); } @Override protected void onLayout(boolean changed,int l,int t,int r,int b) { int top = 0; int bottom = getChildAt(0).getMeasuredHeight(); int left = 0; for (int i = 0; i < getChildCount(); i++) { View view = getChildAt(i); left = (parentWidthSpec - view.getMeasuredWidth()) / 2; view.layout(left,top,left + view.getMeasuredWidth(),bottom); top += view.getMeasuredHeight(); bottom = top + view.getMeasuredHeight(); } Log.d("tzg","bottom: " + bottom); Log.d("tzg","top: " + top); } public void setData(List<String> data) { mData.clear(); if (data.isEmpty()) { return; } this.mData = data; setTextList(); } private void setTextList() { viewFlipper = (ViewFlipper) LayoutInflater.from(getContext()).inflate(R.layout.flow_layout_viewflip,this,false); for (String mDatum : mData) { TextView view = (TextView) LayoutInflater.from(getContext()).inflate(R.layout.flow_layout_textview,false); view.setText(mDatum); viewFlipper.addView(view); } viewFlipper.setInAnimation(getContext(),R.anim.come_in); viewFlipper.setOutAnimation(getContext(),R.anim.come_out); viewFlipper.setFlipInterval(2000); addView(viewFlipper); } @Override protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec) { super.onMeasure(widthMeasureSpec,heightMeasureSpec); parentWidthSpec = MeasureSpec.getSize(widthMeasureSpec); int parentHeightSpec = MeasureSpec.getSize(heightMeasureSpec); int childWidth = MeasureSpec.makeMeasureSpec(parentWidthSpec,MeasureSpec.AT_MOST); int childHeight = MeasureSpec.makeMeasureSpec(parentHeightSpec,MeasureSpec.AT_MOST); int totalHeight = getChildAt(0).getMeasuredHeight(); for (int i = 0; i < getChildCount(); i++) { View view = getChildAt(i); measureChild(view,childWidth,childHeight); } Log.d("tzg","totalCount: " + totalHeight); setMeasuredDimension(parentWidthSpec,totalHeight); } public void startAnimation() { // 1、設定幻燈片的形式滾動 // viewFlipper.startFlipping(); // 2、設定自動翻頁滾動 viewFlipper.setAutoStart(true); viewFlipper.isAutoStart(); } }
用到的資源
1、動畫資源
(1)、come_in.xml
<set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="1000" android:fromYDelta="100%p" android:toYDelta="0"/> </set>
(2)、come_out.xml
<set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="1000" android:fromYDelta="0" android:toYDelta="-100%p"/> </set>
2、佈局資源
(1)、flow_layout_viewflip.xml
<?xml version="1.0" encoding="utf-8"?> <ViewFlipper xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center"> </ViewFlipper>
(2)、flow_layout_textview.xml
<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:padding="5dp" android:text="demo" android:textColor="#FF00FF" />
3、在mainActivity中的使用
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.LinearLayout; import android.widget.Toast; import com.example.myapplication.customview.FlowLayout; import com.example.myapplication.customview.TextBanner; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ArrayList<String> arrayList = new ArrayList<>(); arrayList.add("111111111"); arrayList.add("222222222222444444444444"); arrayList.add("你好5"); arrayList.add("你好633"); arrayList.add("你好a7好a7"); arrayList.add("你好7889"); arrayList.add("你好2323423423 "); arrayList.add("你好sdfsfada你好sdfsfada "); arrayList.add("你好34345"); arrayList.add("pppppppp"); arrayList.add("你好"); arrayList.add("你好你好"); arrayList.add("電視"); arrayList.add("冰箱冰箱冰箱冰箱冰箱冰箱冰箱冰箱冰箱冰箱"); arrayList.add("woaoni"); arrayList.add("襲擊"); arrayList.add("你好"); arrayList.add("你好"); TextBanner viewById = this.findViewById(R.id.text_banner); viewById.setData(arrayList); viewById.startAnimation(); } }
具體效果
沒有自測哦 有bug自己解決
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援我們。