TextView不用获取焦点也能实现跑马灯

1.写一个类继承TextView

[java] view plaincopy

package com.example.tt;

import android.content.Context;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.widget.TextView;

public class ScrollingTextView extends TextView {

public ScrollingTextView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

public ScrollingTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public ScrollingTextView(Context context) {

super(context);

}

@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;

}

}

2.xml 中增加属性

[html] view plaincopy

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<com.example.tt.ScrollingTextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="80dip"

android:layout_marginBottom="25dip"

android:textSize="25sp"

android:singleLine="true"

android:textColor="@android:color/black"

android:ellipsize="marquee"

android:focusable="true"

android:marqueeRepeatLimit="marquee_forever"

android:focusableInTouchMode="true"

android:scrollHorizontally="true"

android:text="这才是真正的文字跑马灯效果,文字移动速度，文字移动方向，文字移动的样式，动画等等……"

android:background="#2FFFFFFF" />

<Button

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Button" />

</LinearLayout>

3. 在activity中声明

[java] view plaincopy

package com.example.tt;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

public class MainActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

}