src/com/android/messaging/ui/ListEmptyView.java


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/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.messaging.ui;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

import com.android.messaging.R;

/**
 * A common reusable view that shows a hint image and text for an empty list view.
 */
public class ListEmptyView extends LinearLayout {
    private ImageView mEmptyImageHint;
    private TextView mEmptyTextHint;

    public ListEmptyView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        mEmptyImageHint = (ImageView) findViewById(R.id.empty_image_hint);
        mEmptyTextHint = (TextView) findViewById(R.id.empty_text_hint);
    }

    public void setImageHint(final int resId) {
        mEmptyImageHint.setImageResource(resId);
    }

    public void setTextHint(final int resId) {
        mEmptyTextHint.setText(getResources().getText(resId));
    }

    public void setTextHint(final CharSequence hintText) {
        mEmptyTextHint.setText(hintText);
    }

    public void setIsImageVisible(final boolean isImageVisible) {
        mEmptyImageHint.setVisibility(isImageVisible ? VISIBLE : GONE);
    }

    public void setIsVerticallyCentered(final boolean isVerticallyCentered) {
        int gravity =
                isVerticallyCentered ? Gravity.CENTER : Gravity.TOP | Gravity.CENTER_HORIZONTAL;
        ((LinearLayout.LayoutParams) mEmptyImageHint.getLayoutParams()).gravity = gravity;
        ((LinearLayout.LayoutParams) mEmptyTextHint.getLayoutParams()).gravity = gravity;
        getLayoutParams().height =
                isVerticallyCentered ? LayoutParams.WRAP_CONTENT : LayoutParams.MATCH_PARENT;
        requestLayout();
    }
}