Android游戏编程之从零开始 P166

Android游戏编程之从零开始

②第二种是利用Regin来对画布设置可视区域。
canvas.clipRegion(region) 过时。
canvas.clipPath(region.getBoundaryPath()) 利用

    private void T3(Canvas canvas) {
        canvas.save();
        canvas.drawColor(Color.WHITE);
        Region region = new Region();
        region.op(new Rect(200, 200, 1000, 1000), Region.Op.UNION);
        region.op(new Rect(400, 300, 900, 900), Region.Op.REVERSE_DIFFERENCE);
        region.op(new Rect(500, 200, 800, 800), Region.Op.XOR);
        canvas.clipPath(region.getBoundaryPath());
        canvas.drawBitmap(bitmapC, 0, 0, paint);
        canvas.restore();
    }

adb devices 查询设备

查询设备
$ adb devices

将文件复制到设备/从设备复制文件
$ adb pull remote local
$ adb push local remote

进行屏幕截图
$ adb shell screencap /sdcard/screen.png

录制视频
$ adb shell screenrecord /sdcard/demo.mp4

ldpi,mdpi,hdpi,xhdpi,xxhdpi,xxxhdpi

ldpi,mdpi,hdpi,xhdpi,xxhdpi,xxxhdpi

float xdpi = getResources().getDisplayMetrics().xdpi;
float ydpi = getResources().getDisplayMetrics().ydpi;

https://blog.csdn.net/guolin_blog/article/details/50727753
https://developer.android.com/reference/android/util/DisplayMetrics.html

AboutDialog の追加

AboutDialog の追加

    public class AboutDialog extends AlertDialog {
        private Context context;

        public AboutDialog(Context context) {
            super(context);
            this.context = context;
        }

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            LinearLayout li = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.about_layout, null);
            TextView textView = li.findViewById(R.id.textView3);
            textView.setText(Html.fromHtml("<u>" + getString(R.string.GooglePlayStore) + "<u>"));
            Pattern pattern = Pattern.compile("");
            String url = getString(R.string.PlayURL);
            Linkify.addLinks(textView, pattern, url, null, null);
            setContentView(li);
        }
    }



<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingLeft="20dp"
    android:paddingTop="10dp"
    android:paddingRight="20dp"
    android:paddingBottom="30dp">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        app:srcCompat="@mipmap/ic_launcher_foreground" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/app_name"
        android:textSize="30dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/kankanla"
        android:textSize="20dp" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"
        android:layout_weight="1"
        android:text="@string/GooglePlayStore"
        android:textSize="20dp" />
</LinearLayout>

Ads SDK

    ******************************************************************************
    * The Google Mobile Ads SDK was initialized incorrectly. AdMob publishers    *
    * should follow the instructions here: https://goo.gl/fQ2neu to add a valid  *
    * App ID inside the AndroidManifest. Google Ad Manager publishers should     *
    * follow instructions here: https://goo.gl/h17b6x.                           *
    ******************************************************************************

3.5 毫米耳机：配件规范

3.5 毫米耳机：配件规范



https://source.android.com/devices/accessories/headset/plug-headset-spec

直接启动

直接启动

<action android:name="android.intent.action.LOCKED_BOOT_COMPLETED" />

https://developer.android.com/training/articles/direct-boot?hl=zh-cn