Edit long text performance test.

/*

 * Copyright (C) 2016 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 android.widget;

import java.util.Arrays;

import java.util.Collection;

import java.util.Locale;

import java.util.Random;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.junit.runners.Parameterized;

import org.junit.runners.Parameterized.Parameters;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.util.Log;

import android.view.KeyEvent;

import android.view.RenderNodeAnimator;

import android.view.ViewGroup;

import android.view.View.MeasureSpec;

import android.perftests.utils.BenchmarkState;

import android.perftests.utils.PerfStatusReporter;

import android.perftests.utils.StubActivity;

import android.support.test.filters.LargeTest;

import android.support.test.runner.AndroidJUnit4;

import android.support.test.annotation.UiThreadTest;

import android.support.test.rule.ActivityTestRule;

import android.support.test.InstrumentationRegistry;

@LargeTest

@RunWith(Parameterized.class)

public class EditTextLongTextPerfTest {

    @Parameters(name = "{0}")

    public static Collection cases() {

        return Arrays.asList(new Object[][] {

            { "10x30K", 10, 30000 },

            { "300x1K", 300, 1000 },

        });

    }

    private final String mMetricKey;

    private final int mChars;

    private final int mLines;

    public EditTextLongTextPerfTest(String metricKey, int chars, int lines) {

        mMetricKey = metricKey;

        mChars = chars;

        mLines = lines;

    }

    @Rule

    public ActivityTestRule<StubActivity> mActivityRule = new ActivityTestRule(StubActivity.class);

    @Rule

    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();

    private EditText setupEditText() {

        final EditText editText = new EditText(mActivityRule.getActivity());

        String alphabet = "abcdefghijklmnopqrstuvwxyz";

        final long seed = 1234567890;

        Random r = new Random(seed);

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < mLines; i++) {

            for (int j = 0; j < mChars; j++) {

                char c = alphabet.charAt(r.nextInt(alphabet.length()));

                sb.append(c);

            }

            sb.append('\n');

        }

        final int height = 1000;

        final int width = 1000;

        editText.setHeight(height);

        editText.setWidth(width);

        editText.setLayoutParams(new ViewGroup.LayoutParams(width, height));

        Activity activity = mActivityRule.getActivity();

        activity.setContentView(editText);

        editText.setText(sb.toString(), TextView.BufferType.EDITABLE);

        editText.invalidate();

        editText.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),

                         MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));

        editText.layout(0, 0, height, width);

        return editText;

    }

    @Test

    @UiThreadTest

    public void testEditText() {

        BenchmarkState state = mPerfStatusReporter.getBenchmarkState();

        final EditText editText = setupEditText();

        final KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_ENTER);

        final int steps = 100;

        while (state.keepRunning()) {

            for (int i = 0; i < steps; i++) {

                int offset = (editText.getText().length() * i) / steps;

                editText.setSelection(offset);

                editText.bringPointIntoView(offset);

                editText.onKeyDown(keyEvent.getKeyCode(), keyEvent);

                editText.updateDisplayListIfDirty();

            }

        }

    }

}