com.jh.blockcanarydemo.DemoFragment.java Source code

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Here is the source code for com.jh.blockcanarydemo.DemoFragment.java

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/*
 * 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.jh.blockcanarydemo;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import java.io.FileInputStream;
import java.io.IOException;

public class DemoFragment extends Fragment implements View.OnClickListener {

    public static DemoFragment newInstance() {
        DemoFragment f = new DemoFragment();
        return f;
    }

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container,
            final Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_main, null);
        return v;
    }

    @Override
    public void onViewCreated(final View view, final Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Button button1 = (Button) view.findViewById(R.id.button1);
        Button button2 = (Button) view.findViewById(R.id.button2);
        Button button3 = (Button) view.findViewById(R.id.button3);

        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }

    @Override
    public void onActivityCreated(final Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button1:
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            break;
        case R.id.button2:
            for (int i = 0; i < 100; ++i) {
                readFile();
            }
            break;
        case R.id.button3:
            double result = compute();
            System.out.println(result);
            break;
        }
    }

    private double compute() {
        double result = 0;
        for (int i = 0; i < 1000000; ++i) {
            result += Math.acos(Math.cos(i));
            result -= Math.asin(Math.sin(i));
        }
        return result;
    }

    private void readFile() {
        FileInputStream reader = null;
        try {
            reader = new FileInputStream("/proc/stat");
            while (reader.read() != -1)
                ;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}