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這篇文章主要講解了Android自定義TextBanner實現自動滾動的方法，內容清晰明了，對此有興趣的小伙伴可以學習一下，相信大家閱讀完之后會有幫助。
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, this, 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、設置幻燈片的形式滾動
// viewFlipper.startFlipping();
// 2、設置自動翻頁滾動
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、布局資源
（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
看完上述內容，是不是對Android自定義TextBanner實現自動滾動的方法有進一步的了解，如果還想學習更多內容，歡迎關注億速云行業資訊頻道。
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