通过Activity的ViewGroup添加ProgressBar

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ProgressBar是一个常见的组件，我们可以通过多种方式来实现一个progressBar,有一种方式是通过一个Activity的的window来放置一个bar，因为android中大家都知道的关联关系是：Activity->Window->View[ViewGroup] ，那我们通过当前Activity的window来加载一个progressBar,当我们把这个Activity作为一个基类的时候，那么它的子类和我们附加在上面的Fragment就可以轻松的展示一个progressbar了[我们把这个自定义的progressbar做一个单例即可]

具体的实现流程如下：

1:需要展示的progressbar布局

一个linearLayout里面包含一个要提示的TextView和一个进度条

<?xml version="1.0" encoding="UTF-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="#00000000"    android:gravity="center" >    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@color/sdk_semitransparent"        android:gravity="center"        android:padding="15dp" >        <ProgressBar            style="@style/sdk_load_progress_style"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:indeterminateDrawable="@drawable/sdk_load_progressbar" />        <TextView            android:id="@+id/progress_txt"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginLeft="5dp"            android:text="@string/sdk_loading" >        </TextView>    </LinearLayout></LinearLayout>

2：实现自定义progressbar

里面的注释还是比较清楚的，就是通过Activity获取到一个Window,然后添加进来一个我们需要展示的布局

public class ProgressView {    //要展示的progressbar布局    private View mDialogView;    //从当前Activity获取的ViewGroup 【mFLayout】    private ViewGroup mFragmentView;    //新建一个layout,放置我们的progressbar，主要作用是设置一些现实属性    private LinearLayout mFLayout;       //单例对象    private static ProgressView mInstance;    //需要提示的文字View    private TextView mProgressText;    //设置是否可取消    private boolean mCancelable = true;    private ProgressView() {    }    public static synchronized ProgressView getInstance() {        if (mInstance == null) {            mInstance = new ProgressView();        }        return mInstance;    }    public void showProgressView(Activity act, int loadingTextId,            boolean cancelable) {        showProgressView(act, ResUtil.getString(loadingTextId), cancelable);    }    public void showProgressView(Activity act, int loadingTextId) {        showProgressView(act, ResUtil.getString(loadingTextId), true);    }    public void showProgressView(Activity act, String tipStr) {        showProgressView(act, tipStr, true);    }    public void showDilaogProgressView(Activity act, String tipStr) {        dialogProgressView(act, tipStr, true);    }    /**     *      * 〈一句话功能简述〉<br>     * 〈功能详细描述〉     *      * @param act content     * @param loading_text progress显示的String     */    public void showProgressView(Activity act, String loading_text,            boolean cancelable) {        mDialogView = act.getLayoutInflater().inflate(                R.layout.sdk_dialog_progress, null);        mProgressText = (TextView) mDialogView.findViewById(R.id.progress_txt);

        //这个layout_base就是我们Activity中内容要显示的一个跟布局        mFragmentView = (ViewGroup) act.getWindow().findViewById(                R.id.layout_base);        mCancelable = cancelable;        mFLayout = new LinearLayout(act);        if (!TextUtils.isEmpty(loading_text)) {            mProgressText.setText(loading_text);        }        init();    }    /**     *      * 〈一句话功能简述〉<br>     * 〈功能详细描述〉     *      * @param act content     * @param loading_text progress显示的String     */    public void dialogProgressView(Activity act, String loading_text,            boolean cancelable) {        mDialogView = act.getLayoutInflater().inflate(                R.layout.sdk_dialog_progress, null);        mProgressText = (TextView) mDialogView.findViewById(R.id.progress_txt);        mFragmentView = (ViewGroup) act.getWindow().findViewById(                R.id.skd2_base_content);        mCancelable = cancelable;        mFLayout = new LinearLayout(act);        if (!TextUtils.isEmpty(loading_text)) {            mProgressText.setText(loading_text);        }        init();    }    private void init() {        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(                LinearLayout.LayoutParams.MATCH_PARENT,                LinearLayout.LayoutParams.MATCH_PARENT);        params.addRule(RelativeLayout.CENTER_IN_PARENT);        mFLayout.setLayoutParams(params);        mFLayout.setBackgroundColor(ResUtil.getColor(R.color.sdk_transparent));        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(                LinearLayout.LayoutParams.MATCH_PARENT,                LinearLayout.LayoutParams.WRAP_CONTENT);        layoutParams.gravity = Gravity.CENTER;        layoutParams.setMargins(20, 0, 20, 0);        mFLayout.addView(mDialogView, layoutParams);        addDialogContentView();    }    private void addDialogContentView() {        if (mFragmentView != null) {            mFragmentView.addView(mFLayout, new LinearLayout.LayoutParams(                    LinearLayout.LayoutParams.MATCH_PARENT,                    LinearLayout.LayoutParams.MATCH_PARENT));        }        mFLayout.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                // 当progress弹出时拦截页面点击事件            }        });    }    public void dismissProgress() {        if (mFragmentView != null && mFLayout != null) {            mFragmentView.removeView(mFLayout);        }        reset();    }    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (!mCancelable) {            reset();            return true;        }        if (keyCode == KeyEvent.KEYCODE_BACK) { // 监控/拦截/屏蔽返回键            if (mFragmentView == null || mDialogView == null                    || mFLayout == null) {                return true;            }            dismissProgress();            return false;        }        return true;    }    private void reset() {        mDialogView = null;        mFragmentView = null;        mFLayout = null;    }}

3：用法

//展示ProgressView.getInstance().showProgressView(avtivityA,"信息加中");//取消ProgressView.getInstance().dismissProgress();

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