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一分钟实现 Android textview 跑马灯文字滚动效果

2015-06-01 13:54 1071 查看
*文字水平跑马灯效果:

设置如下TextView控件文件的XML:

<com.example.Mytext
android:id="@+id/textview"
android:layout_width="match_parent"
android:layout_height="20dp"
android:gravity="center"
android:singleLine="true"//限制行数为1行
android:ellipsize="marquee"//marquee 文字滚动
android:marqueeRepeatLimit="marquee_forever"//文字滚动次数:marquee_forever 无限次
android:focusable="true"//获取焦点
android:focusableInTouchMode="true"//获取触摸焦点
android:textColor="@color/red"
android:text="@string/text"
/>


有其它布局如ScrollView等抢占焦点,需要自定义控件获取焦点:

public class Mytext extends TextView {
public Mytext(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onFocusChanged(boolean focused, int direction,
Rect previouslyFocusedRect) {
if(focused){
super.onFocusChanged(focused, direction, previouslyFocusedRect);
}
}
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
if(hasWindowFocus){
super.onWindowFocusChanged(hasWindowFocus);
}
}
@Override
public boolean isFocused() {
return true;
}
}


*文字切换动画效果:

1 public class MainActivity extends Activity {
2     private static final String[] TEXTS = { "First", "Second", "Third" };
3     private int mTextsPosition = 0;
4     private TextSwitcher mTextSwitcher;
5     @Override
6     public void onCreate(Bundle savedInstanceState) {
7         super.onCreate(savedInstanceState);
8         setContentView(R.layout.main);
9         mTextSwitcher = (TextSwitcher) findViewById(R.id.your_textview);
10         mTextSwitcher.setFactory(new ViewFactory() {
11             @Override
12             public View makeView() {
13                 System.out.println("makeView");
14                 TextView t = new TextView(MainActivity.this);
15                 t.setGravity(Gravity.CENTER);//t.setTextColor(Color.BLACK);
16                 return t;
17             }
18         });
19         mTextSwitcher.setInAnimation(this, android.R.anim.fade_in);
20         mTextSwitcher.setOutAnimation(this, android.R.anim.fade_out);
21         onSwitchText(null);
22     }
23     public void onSwitchText(View v) {
24         mTextSwitcher.setText(TEXTS[mTextsPosition]);
25         setNextPosition();
26     }
27     private void setNextPosition() {
28         mTextsPosition = (mTextsPosition + 1) % TEXTS.length;
29     }
30 }
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