Android Studio一個簡單橫向跑馬燈的實現
阿新 • • 發佈:2018-11-15
記錄一個Android中簡單實現跑馬燈功能的方法:僅僅實現了單行跑馬燈的功能,對於速度的調整 ,沒有實現。記錄一下以便日後檢視。
首先在MainActivity下新建一個名為MarqueeTextView的.java 檔案
MarqueeTextView.java程式碼如下:
package com.example.chenhy.pmdtest; import android.content.Context; import android.graphics.Rect; import android.text.TextUtils; import android.util.AttributeSet; import android.widget.TextView; public class MarqueeTextView extends TextView { private int speed = 4; public void setSpeed(int speed) { this.speed = speed; } public MarqueeTextView(Context context) { this(context, null); } public MarqueeTextView(Context context, AttributeSet attrs) { super(context, attrs); setFocusable(true); setFocusableInTouchMode(true); setSingleLine(); setEllipsize(TextUtils.TruncateAt.MARQUEE); setMarqueeRepeatLimit(-1); } public MarqueeTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setFocusable(true); setFocusableInTouchMode(true); setSingleLine(); setEllipsize(TextUtils.TruncateAt.MARQUEE); setMarqueeRepeatLimit(-1); } @Override protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) { if (focused) { super.onFocusChanged(focused, direction, previouslyFocusedRect); } } @Override public void onWindowFocusChanged(boolean focused) { if (focused) { super.onWindowFocusChanged(focused); } } @Override public boolean isFocused() { return true; } }
佈局檔案
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" 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.chenhy.pmdtest.MainActivity"> <com.example.chenhy.pmdtest.MarqueeTextView android:id="@+id/pmd" android:layout_width="match_parent" android:layout_height="match_parent" android:textSize="30sp" /> </LinearLayout>
最後是mainactivity中的程式碼
package com.example.chenhy.pmdtest; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Menu; public class MainActivity extends AppCompatActivity { MarqueeTextView PMD ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); PMD = (MarqueeTextView)findViewById(R.id.pmd); PMD.setText("塞納河畔 左岸的咖啡 我手一杯 品嚐你的美 留下脣印的嘴 花店玫瑰 名字寫錯誰 告白氣球 風吹到對街 微笑在天上飛"); } }
最後,上一張效果圖