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TextSwitcher
版本：Android 2.2 r1
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public class TextSwitcher extends ViewSwitcher
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java.lang.Object
???????? android.view.View
? ???? ???????? android.view.ViewGroup
??????????????????????????? android.widget.FrameLayout
???????????????????????????????????? android.widget.ViewAnimator
? ???? ?????? ??????????????????????????? android.widget.ViewSwitcher
? ???? ?????? ?????? ??????????????????????????? android.widget.TextSwitcher
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概述
???????? 
???????? ViewSwitcher僅僅包含子類型TextView。TextSwitcher被用來使屏幕上的label產(chǎn)生動畫效果。每當(dāng)setText(CharSequence)被調(diào)用時，TextSwitcher使用動畫方式將當(dāng)前的文字內(nèi)容消失并顯示新的文字內(nèi)容。
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構(gòu)造函數(shù)
???????? public TextSwitcher (Context context)
???????? 創(chuàng)建一個新的空TextSwitcher
?????????????????? 參數(shù)
context? 應(yīng)用程序上下文
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???????? public TextSwitcher (Context context, AttributeSet attrs)
???????? 使用提供的context和attributes來創(chuàng)建一個空的TextSwitcher
?????????????????? 參數(shù)
??????????????????????????? context? 應(yīng)用程序環(huán)境
??????????????????????????? attrs?????????????????? 屬性集合
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公共方法???????
???????? public void addView (View child, int index, ViewGroup.LayoutParams params)
???????? 根據(jù)指定的布局參數(shù)新增一個子視圖
?????????????????? 參數(shù)
??????????????????????????? child????????? 新增的子視圖
??????????????????????????? index???????? 新增子視圖的位置
??????????????????????????? params??? 新增子視圖的布局參數(shù)
???????? 拋出異常
?????????????????? IllegalArgumentException?????? 當(dāng)子視圖不是一個TextView實例時
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???????? public void setCurrentText (CharSequence text)
???????? 設(shè)置當(dāng)前顯示的文本視圖的文字內(nèi)容。非動畫方式顯示。
?????????????????? 參數(shù)
??????????????????????????? text?????????? 需要顯示的新文本內(nèi)容
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???????? public void setText (CharSequence text)
???????? 設(shè)置下一視圖的文本內(nèi)容并切換到下一視圖?？梢詣赢嫷耐顺霎?dāng)前文本內(nèi)容，顯示下一文本內(nèi)容。
?????????????????? 參數(shù)
??????????????????????????? text?????????? 需要顯示的新文本內(nèi)容
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示例
???????? 摘自APIDemos->View->TextSwitcher
Java:
public class TextSwitcher1 extends Activity implements ViewSwitcher.ViewFactory,
??????? View.OnClickListener {
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??? private TextSwitcher mSwitcher;
??? private int mCounter = 0;
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??? @Override
??? protected void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
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??????? setContentView(R.layout.text_switcher_1);
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??????? mSwitcher = (TextSwitcher) findViewById(R.id.switcher);
??????? mSwitcher.setFactory(this);
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??????? Animation in = AnimationUtils.loadAnimation(this,
??????????????? android.R.anim.fade_in);
??????? Animation out = AnimationUtils.loadAnimation(this,
??????????????? android.R.anim.fade_out);
??????? mSwitcher.setInAnimation(in);
??????? mSwitcher.setOutAnimation(out);
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? ??????Button nextButton = (Button) findViewById(R.id.next);
??????? nextButton.setOnClickListener(this);
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??????? updateCounter();
??? }
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??? public void onClick(View v) {
??????? mCounter++;
??????? updateCounter();
??? }
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??? private void updateCounter() {
??????? mSwitcher.setText(String.valueOf(mCounter));
??? }
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??? public View makeView() {
??????? TextView t = new TextView(this);
??????? t.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
??????? t.setTextSize(36);
??????? return t;
??? }
}
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Xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
??? android:layout_width="match_parent"
??? android:layout_height="match_parent"
??? android:orientation="vertical">
??? <Button android:id="@+id/next"
??????? android:layout_width="wrap_content"
??????? android:layout_height="wrap_content"
??????? android:text="@string/text_switcher_1_next_text" />
??? <TextSwitcher android:id="@+id/switcher"
??????? android:layout_width="match_parent"
??????? android:layout_height="wrap_content" />
</LinearLayout>