Android(安卓)Toast 保持一直显示。

package android.widget;import android.app.ITransientNotification;import android.content.Context;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import java.lang.reflect.Field;public class ToastUtils {    private static Toast mToast = null ;    public static final int MEDIA_TYPE_MUSIC = 0x00000001;    public static final int MEDIA_STATUS_LOADING = 0x10000000;    public static void showMediaStatusToast(Context context, int mediaType, String msg) {        TextView toastMsg = null;        ImageView toastImage = null;        if (mToast == null) {            LayoutInflater inflate = (LayoutInflater)                    context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);            View toastView = inflate.inflate(com.android.internal.R.layout.media_ready_toast, null);            toastMsg = ((TextView) toastView.findViewById(com.android.internal.R.id.tv_toast_clear));            toastImage = (ImageView) toastView.findViewById(com.android.internal.R.id.iv_toast_clear);            mToast = new Toast(context.getApplicationContext());            mToast.setDuration(Toast.LENGTH_SHORT);            mToast.setGravity(Gravity.CENTER, 0, 0);            mToast.setView(toastView);        } else {            toastMsg = (TextView) mToast.getView().findViewById(com.android.internal.R.id.tv_toast_clear);            toastImage = (ImageView) mToast.getView().findViewById(com.android.internal.R.id.iv_toast_clear);        }        switch(mediaType) {            case MEDIA_TYPE_MUSIC://music                toastImage.setImageResource(com.android.internal.R.drawable.img_no_usb);                break;            case MEDIA_STATUS_LOADING://loading                toastImage.setImageResource(com.android.internal.R.drawable.media_progress);                toastMsg.setText(msg);                showProgress();                break;        }        if (mediaType != MEDIA_STATUS_LOADING) {            toastMsg.setText(msg);            mToast.show();        }    }    private static void showProgress() {        if (mToast != null) {            try {                Field toastNextView = mToast.getClass().getDeclaredField("mNextView");                toastNextView.setAccessible(true);                Object toastView = toastNextView.get(mToast);                toastNextView.setAccessible(false);                Field mTN = mToast.getClass().getDeclaredField("mTN");                mTN.setAccessible(true);                Object tn = mTN.get(mToast);                mTN.setAccessible(false);                Field tnView = tn.getClass().getDeclaredField("mNextView");                tnView.setAccessible(true);                tnView.set(tn, toastView);                tnView.setAccessible(false);                ITransientNotification notification = (ITransientNotification) mTN.get(mToast);                notification.show();            } catch (Exception e) {                e.printStackTrace();            }        }    }    public static void hideProgress() {        if (mToast != null) {            try {                Field mTN = mToast.getClass().getDeclaredField("mTN");                ITransientNotification notification = (ITransientNotification) mTN.get(mToast);                notification.hide();            } catch (Exception e) {                e.printStackTrace();            }        }    }}
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