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android开发标题,Android标题栏TitleBar全攻略 Android开发技术

鲁涵映
2023-12-01

Android标题栏TitleBar全攻略 Android开发技术

2013 年 3 月 24 日

很多细心的网友发现Android浏览器的标题栏TitleBar的功能比较多,细心的网友在查看Browser时会发现,从左到右依次为网站图标(favicon)、标题、最右边的动画进度条(圆圈)、背景进度条(和前面的不在一层),今天我们就一起来看看Android标题栏高级实现方法。

在Android Browser程序中标题栏是自绘的,TitleBar类继承于线性布局LinearLayout类,通过LayoutInflater调用layout中的xml布局文件实现相关方法

public class TitleBar extends LinearLayout {

private TextView        mTitle; //标题文字

private Drawable        mCloseDrawable;

private ImageView       mRtButton;

private Drawable        mCircularProgress; //圆圈进度指示

private ProgressBar     mHorizontalProgress; //水平进度条

private ImageView       mFavicon; //网站图标

private ImageView       mLockIcon;

private Drawable        mStopDrawable; //停止状态的图标

private Drawable        mBookmarkDrawable; //是一个书签的图标

private boolean         mInLoad;

private BrowserActivity mBrowserActivity;

private Drawable        mGenericFavicon; //如果站点没有favicon.ico时显示的默认图标

private int             mIconDimension;

private View            mTitleBg; //文字的背景

private MyHandler       mHandler;

private static int LONG_PRESS = 1;

public TitleBar(BrowserActivity context) {

super(context, null);

mHandler = new MyHandler();

LayoutInflater factory = LayoutInflater.from(context);

factory.inflate(R.layout.title_bar, this); //从xml文件创建,android123提示大家,该文件的详细内容在本段代码最下方。

mBrowserActivity = context;

mTitle = (TextView) findViewById(R.id.title);

mTitle.setCompoundDrawablePadding(5);

mTitleBg = findViewById(R.id.title_bg);

mLockIcon = (ImageView) findViewById(R.id.lock);

mFavicon = (ImageView) findViewById(R.id.favicon);

mRtButton = (ImageView) findViewById(R.id.rt_btn);

Resources resources = context.getResources();

mCircularProgress = (Drawable) resources.getDrawable(com.android.internal.R.drawable.search_spinner);

mIconDimension = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20f,resources.getDisplayMetrics());

mCircularProgress.setBounds(0, 0, mIconDimension, mIconDimension);

mHorizontalProgress = (ProgressBar) findViewById(R.id.progress_horizontal);

mGenericFavicon = context.getResources().getDrawable(R.drawable.app_web_browser_sm);

}

private class MyHandler extends Handler {

public void handleMessage(Message msg) {

if (msg.what == LONG_PRESS) {

mTitleBg.setPressed(false);

mBrowserActivity.showTitleBarContextMenu();

}

}

};

@Override

protected void onCreateContextMenu(ContextMenu menu) { //创建上下文菜单,相关的xml代码在本文最后

MenuInflater inflater = mBrowserActivity.getMenuInflater();

inflater.inflate(R.menu.title_context, menu);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN:

if ((int) event.getX() > mTitleBg.getRight()) {

mRtButton.setPressed(true);

} else {

mTitleBg.setPressed(true);

mHandler.sendMessageDelayed(mHandler.obtainMessage(

LONG_PRESS),

ViewConfiguration.getLongPressTimeout());

}

break;

case MotionEvent.ACTION_MOVE:

int slop = ViewConfiguration.get(mBrowserActivity)

.getScaledTouchSlop();

if ((int) event.getY() > getHeight() + slop) {

mTitleBg.setPressed(false);

mRtButton.setPressed(false);

mHandler.removeMessages(LONG_PRESS);

break;

}

int x = (int) event.getX();

int titleRight = mTitleBg.getRight();

if (mTitleBg.isPressed() && x > titleRight + slop) {

mTitleBg.setPressed(false);

mHandler.removeMessages(LONG_PRESS);

} else if (mRtButton.isPressed() && x < titleRight – slop) {

mRtButton.setPressed(false);

}

break;

case MotionEvent.ACTION_CANCEL:

mRtButton.setPressed(false);

mTitleBg.setPressed(false);

mHandler.removeMessages(LONG_PRESS);

break;

case MotionEvent.ACTION_UP:

if (mRtButton.isPressed()) {

if (mInLoad) {

mBrowserActivity.stopLoading();

} else {

mBrowserActivity.bookmarksOrHistoryPicker(false);

}

mRtButton.setPressed(false);

} else if (mTitleBg.isPressed()) {

mHandler.removeMessages(LONG_PRESS);

mBrowserActivity.onSearchRequested();

mTitleBg.setPressed(false);

}

break;

default:

break;

}

return true;

}

boolean isInLoad() {

return mInLoad;

}

void setFavicon(Bitmap icon) {

Drawable[] array = new Drawable[3];

array[0] = new PaintDrawable(Color.BLACK);

PaintDrawable p = new PaintDrawable(Color.WHITE);

array[1] = p;

if (icon == null) {

array[2] = mGenericFavicon;

} else {

array[2] = new BitmapDrawable(icon);

}

LayerDrawable d = new LayerDrawable(array);

d.setLayerInset(1, 1, 1, 1, 1);

d.setLayerInset(2, 2, 2, 2, 2);

mFavicon.setImageDrawable(d);

}

void setLock(Drawable d) {

if (null == d) {

mLockIcon.setVisibility(View.GONE);

} else {

mLockIcon.setImageDrawable(d);

mLockIcon.setVisibility(View.VISIBLE);

}

}

void setProgress(int newProgress) {

if (newProgress >= mHorizontalProgress.getMax()) {

mTitle.setCompoundDrawables(null, null, null, null);

((Animatable) mCircularProgress).stop();

mHorizontalProgress.setVisibility(View.INVISIBLE);

if (mBookmarkDrawable != null) {

mRtButton.setImageDrawable(mBookmarkDrawable);

}

mInLoad = false;

} else {

mHorizontalProgress.setProgress(newProgress);

if (!mInLoad && getWindowToken() != null) {

mTitle.setCompoundDrawables(null, null, mCircularProgress,

null);

((Animatable) mCircularProgress).start();

mHorizontalProgress.setVisibility(View.VISIBLE);

if (mBookmarkDrawable == null) {

mBookmarkDrawable = mRtButton.getDrawable();

}

if (mStopDrawable == null) {

mRtButton.setImageResource(R.drawable.ic_btn_stop_v2);

mStopDrawable = mRtButton.getDrawable();

} else {

mRtButton.setImageDrawable(mStopDrawable);

}

mInLoad = true;

}

}

}

void setTitleAndUrl(CharSequence title, CharSequence url) {

if (url == null) {

mTitle.setText(R.string.title_bar_loading);

} else {

mTitle.setText(url.toString());

}

}

void setToTabPicker() {

mTitle.setText(R.string.tab_picker_title);

setFavicon(null);

setLock(null);

mHorizontalProgress.setVisibility(View.GONE);

}

}

本文的相关的title_bar.xml布局文件内容,其中大家可以理解下部分图标在创建时使用隐藏GONE的visibility显示属性,通过条件来设置其显示

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="vertical"

android:paddingLeft="8dip"

android:paddingRight="12dip"

android:paddingTop="2dip"

android:paddingBottom="1dip"

android:background="@drawable/search_plate_browser" >

style="?android:attr/progressBarStyleHorizontal"

android:layout_width="fill_parent"

android:layout_height="5dip"

android:max="100"

/>

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

>

android:background="@drawable/title_text"

android:layout_width="0dip"

android:layout_weight="1.0"

android:layout_height="wrap_content"

android:gravity="center_vertical"

android:orientation="horizontal"

>

android:layout_width="20dip"

android:layout_height="20dip"

android:layout_marginLeft="3dip"

/>

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="6dip"

android:visibility="gone"

/>

android:id="@+id/title"

android:layout_height="wrap_content"

android:layout_width="0dip"

android:layout_weight="1.0"

android:paddingLeft="8dip"

android:paddingRight="6dip"

android:textAppearance="?android:attr/textAppearanceMedium"

android:textColor="@color/black"

android:gravity="center_vertical"

android:singleLine="true"

android:ellipsize="end"

/>

android:id="@+id/rt_btn"

android:layout_width="wrap_content"

android:layout_height="fill_parent"

android:layout_marginLeft="6dip"

android:scaleType="center"

android:layout_marginBottom="4dip"

android:background="@drawable/btn_bookmark"

android:src="@drawable/ic_btn_bookmarks"

/>

以下为 title_context.xml,里面仅有两条一个为分享该页和复制本页的URL

android:title="@string/share_page"/>

android:title="@string/copy_page_url"/>

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