一直想實現一個豎直跑馬燈的效果,今天接觸到了ViewFlipper這個控件, 是做安卓視圖切換的, 對其用自定義控件進行包裝;實現其點擊回調和自定義視圖等功能
不多說,直接上代碼:
定義了一個自定義控件, 繼承LinearLayout
package com.example.viewfipperdemo; import android.content.Context; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.ViewFlipper; /** * Created by zmybi on 2017/1/19. */ public class MarqueeTextView extends LinearLayout { private Context mContext; private String[] strs; private View mView; private OnTextClickListener mOnTextClickListener; private ViewFlipper mViewFlipper; public MarqueeTextView(Context context) { this(context,null); this.mContext = context; } public MarqueeTextView(Context context, AttributeSet attrs) { super(context, attrs); this.mContext = context; initBasicView(); } /** * 用于外界向里面傳值,并且初始化控件中的ViewFipper * @param str * @param onTextClickListener */ public void setData(String[] str,OnTextClickListener onTextClickListener) { this.strs = str; this.mOnTextClickListener = onTextClickListener; initViewFipper(); } private void initBasicView() { mView = LayoutInflater.from(mContext).inflate(R.layout.layout_viewfipper,null); mViewFlipper = (ViewFlipper) mView.findViewById(R.id.viewflipper); mViewFlipper.setInAnimation(mContext,R.anim.in); //進來的動畫 mViewFlipper.setOutAnimation(mContext,R.anim.out); //出去的動畫 LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); addView(mView,params); mViewFlipper.startFlipping(); } /** * 定義銷毀的方法 */ public void clearViewFlipper() { if(mView != null) { if(mViewFlipper != null) { mViewFlipper.stopFlipping(); mViewFlipper.removeAllViews(); mViewFlipper =null; } mView = null; } } /** * 初始化viewFipper中的自孩子視圖 */ private void initViewFipper() { if(strs.length == 0) { return; } int i = 0; mViewFlipper.removeAllViews(); while (i < strs.length) { //循環3次 final TextView tv = new TextView(mContext); tv.setText(strs[i]); tv.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if(mOnTextClickListener != null) { mOnTextClickListener.onClick(tv); } } }); mViewFlipper.addView(tv); i++; } } } 給viewFlipper設置動畫的寫法:
in.xml
<?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="50%p" android:toYDelta="0" /> <alpha android:duration="@android:integer/config_mediumAnimTime" android:fromAlpha="0.0" android:toAlpha="1.0" /> </set>
out.xml:
<?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="0" android:toYDelta="-50%p" /> <alpha android:duration="@android:integer/config_mediumAnimTime" android:fromAlpha="1.0" android:toAlpha="0.0" /> </set>
我們看一下layout_viewflipper布局的寫法:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ViewFlipper android:padding="10dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/viewflipper" android:background="#33ff0000" android:flipInterval="2000" ></ViewFlipper> </LinearLayout>
其中flipInterval 是決定切換的時間的
我們再來看看MainActivity中的代碼:
package com.example.viewfipperdemo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { /** * 自定義的可滾動的TextView */ private MarqueeTextView mMarqueeTextView; private String[] str = {"我是1","我是2","我是3"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mMarqueeTextView = (MarqueeTextView) findViewById(R.id.marqueetextview); mMarqueeTextView.setData(str, new OnTextClickListener() { @Override public void onClick(View view) { Toast.makeText(MainActivity.this,((TextView)view).getText(),Toast.LENGTH_LONG).show(); } }); } @Override protected void onDestroy() { super.onDestroy(); mMarqueeTextView.clearViewFlipper(); } } 對了,還定義了一個接口:
package com.example.viewfipperdemo; import android.view.View; /** * Created by zmybi on 2017/1/19. */ public interface OnTextClickListener { void onClick(View view); } 至此，如上的豎直跑馬燈就完成了。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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