2013.12.03（4） ——— android ActionbarSherlockSample之Progress-优快云博客

本文链接：https://blog.youkuaiyun.com/cody123/article/details/84509092

本文深入解析了Android ActionBarSherlockSample中关于Progress的实现细节，包括使用Handler和Runnable进行计数更新，以及如何在进度条上显示渐变消失效果。通过实例代码演示，帮助开发者理解并应用这一特性。

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2013.12.03（4） ——— android ActionbarSherlockSample之Progress

/*
 * Copyright (C) 2011 Jake Wharton
 *
 * 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.actionbarsherlock.sample.demos;

import android.os.Bundle;
import android.os.Handler;
import android.view.View;

import com.actionbarsherlock.app.SherlockActivity;
import com.actionbarsherlock.view.Window;

public class Progress extends SherlockActivity  {
    Handler mHandler = new Handler();
    Runnable mProgressRunner = new Runnable() {
        @Override
        public void run() {
            mProgress += 2;

            //Normalize our progress along the progress bar's scale
            int progress = (Window.PROGRESS_END - Window.PROGRESS_START) / 100 * mProgress;
            setSupportProgress(progress);

            if (mProgress < 100) {
                mHandler.postDelayed(mProgressRunner, 50);
            }
        }
    };

    private int mProgress = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setTheme(SampleList.THEME); //Used for theme switching in samples
        super.onCreate(savedInstanceState);

        //This has to be called before setContentView and you must use the
        //class in com.actionbarsherlock.view and NOT android.view
        requestWindowFeature(Window.FEATURE_PROGRESS);

        setContentView(R.layout.progress);

        findViewById(R.id.go).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                if (mProgress == 100) {
                    mProgress = 0;
                    mProgressRunner.run();
                }
            }
        });
    }
}

注意

requestWindowFeature(Window.FEATURE_PROGRESS);

这个Window是actionbarsherlock带的不是系统的

计算进度

int progress = (Window.PROGRESS_END - Window.PROGRESS_START) / 100 * mProgress;
setSupportProgress(progress);

加载到100%后，进度条会有渐变消失的效果