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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 android.windowanimationjank;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.Chronometer;
import android.widget.RadioButton;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.ToggleButton;
/*
* Activity with arbitrary number of random UI elements, refresh itself constantly.
*/
public class ElementLayoutActivity extends Activity implements OnPreDrawListener {
public final static String NUM_ELEMENTS_KEY = "num_elements";
private final static int DEFAULT_NUM_ELEMENTS = 100;
private final static int BACKGROUND_COLOR = 0xfffff000;
private final static int INDICATOR_COLOR = 0xffff0000;
private FlowLayout mLayout;
// Use the constant seed in order to get predefined order of elements.
private Random mRandom = new Random(0);
// Blinker indicator for visual feedback that Activity is currently updating.
private TextView mIndicator;
private static float mIndicatorState;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.flowlayout);
mLayout = (FlowLayout)findViewById(R.id.root_flow_layout);
mLayout.setBackgroundColor(BACKGROUND_COLOR);
mIndicator = new TextView(this);
mLayout.addView(mIndicator);
mIndicator.setText("***\n***");
mIndicator.setBackgroundColor(BACKGROUND_COLOR);
mIndicatorState = 0.0f;
// Need constantly invalidate view in order to get max redraw rate.
mLayout.getViewTreeObserver().addOnPreDrawListener(this);
// Read requested number of elements in layout.
int numElements = getIntent().getIntExtra(NUM_ELEMENTS_KEY, DEFAULT_NUM_ELEMENTS);
for (int i = 0; i < numElements; ++i) {
switch (mRandom.nextInt(5)) {
case 0:
createRadioButton();
break;
case 1:
createToggleButton();
break;
case 2:
createSwitch();
break;
case 3:
createTextView();
break;
case 4:
createChronometer();
break;
}
}
setContentView(mLayout);
}
private void createTextView() {
TextView textView = new TextView(this);
int lineCnt = mRandom.nextInt(4);
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < lineCnt; ++i) {
if (i != 0) {
buffer.append("\n");
}
buffer.append("Line:" + mRandom.nextInt());
}
textView.setText(buffer);
mLayout.addView(textView);
}
private void createRadioButton() {
RadioButton button = new RadioButton(this);
button.setText("RadioButton:" + mRandom.nextInt());
mLayout.addView(button);
}
private void createToggleButton() {
ToggleButton button = new ToggleButton(this);
button.setChecked(mRandom.nextBoolean());
mLayout.addView(button);
}
private void createSwitch() {
Switch button = new Switch(this);
button.setChecked(mRandom.nextBoolean());
mLayout.addView(button);
}
private void createChronometer() {
Chronometer chronometer = new Chronometer(this);
chronometer.setBase(mRandom.nextLong());
mLayout.addView(chronometer);
chronometer.start();
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public boolean onPreDraw() {
// Interpolate indicator color
int background = 0xff000000;
for (int i = 0; i < 3; ++i) {
int shift = 8 * i;
int colorB = (BACKGROUND_COLOR >> shift) & 0xff;
int colorI = (INDICATOR_COLOR >> shift) & 0xff;
int color = (int)((float)colorB * (1.0f - mIndicatorState) +
(float)colorI * mIndicatorState);
if (color > 255) {
color = 255;
}
background |= (color << shift);
}
mIndicator.setBackgroundColor(background);
mIndicatorState += (3 / 60.0f); // around 3 times per second
mIndicatorState = mIndicatorState - (int)mIndicatorState;
mLayout.postInvalidate();
return true;
}
}
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