1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package androidx.core.app; 18 19 import android.app.Activity; 20 import android.graphics.Color; 21 import android.os.Bundle; 22 import android.view.View; 23 import android.view.ViewGroup; 24 import android.widget.LinearLayout; 25 26 public class FrameMetricsActivity extends Activity { 27 28 LinearLayout mLayout; 29 View mView; 30 31 @Override onCreate(Bundle savedInstanceState)32 protected void onCreate(Bundle savedInstanceState) { 33 super.onCreate(savedInstanceState); 34 35 mLayout = new LinearLayout(this); 36 mLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 37 ViewGroup.LayoutParams.MATCH_PARENT)); 38 mLayout.setBackgroundColor(Color.BLUE); 39 setContentView(mLayout); 40 41 mView = new View(this); 42 mView.setLayoutParams(new LinearLayout.LayoutParams(500, 500)); 43 mView.setBackgroundColor(Color.GREEN); 44 mLayout.addView(mView); 45 } 46 invalidate()47 public void invalidate() { 48 mLayout.invalidate(); 49 mLayout.setBackgroundColor(Color.rgb((int) (255 * Math.random()), 50 (int) (255 * Math.random()), (int) (255 * Math.random()))); 51 } 52 } 53