一直想实现一个竖直跑马灯的效果,今天接触到了ViewFlipper这个控件, 是做安卓视图切换的, 对其用自定义控件进行包装;实现其点击回调和自定义视图等功能
不多说,直接上代码:
定义了一个自定义控件, 继承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();
}
/**
* 用于外界向里面传值,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); //进来的动画
mViewFlipper.setOutAnimation(mContext,R.anim.out); //出去的动画
LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
addView(mView,params);
mViewFlipper.startFlipping();
}
/**
* 定义销毁的方法
*/
public void clearViewFlipper() {
if(mView != null) {
if(mViewFlipper != null) {
mViewFlipper.stopFlipping();
mViewFlipper.removeAllViews();
mViewFlipper =null;
}
mView = null;
}
}
/**
* 初始化viewFipper中的自孩子视图
*/
private void initViewFipper() {
if(strs.length == 0) {
return;
}
int i = 0;
mViewFlipper.removeAllViews();
while (i < strs.length) { //循环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++;
}
}
}
给viewFlipper设置动画的写法:
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>
我们看一下layout_viewflipper布局的写法:
<?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 是决定切换的时间的
我们再来看看MainActivity中的代码:
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 {
/**
* 自定义的可滚动的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();
}
}
对了,还定义了一个接口:
package com.example.viewfipperdemo;
import android.view.View;
/**
* Created by zmybi on 2017/1/19.
*/
public interface OnTextClickListener {
void onClick(View view);
}
至此，如上的竖直跑马灯就完成了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
