如何在程序中确定 Android 设备屏幕尺寸类别(小、普通、大、超大)?
此示例演示如何通过编程方式确定 Android 设备屏幕尺寸类别(小、普通、大、超大)。
步骤 1 - 在 Android Studio 中创建一个新项目,转到文件 ⇒ 新建项目,并填写所有必需的详细信息以创建新项目。
步骤 2 - 将以下代码添加到 res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp" tools:context=".MainActivity"> <Button android:id="@+id/btnGetScreenSize" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:onClick="GetScreenSize" android:text="Get ScreenSize" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/btnGetScreenSize" android:layout_centerInParent="true" android:layout_marginTop="10dp" android:onClick="GetScreenDensity" android:text="Get Screen Density" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="40dp" android:text="Android device screen size category (small, normal, large, xlarge)" android:textAlignment="center" android:textSize="24sp" android:textStyle="bold|italic" /> </RelativeLayout>
步骤 3 - 将以下代码添加到 src/MainActivity.java
import androidx.appcompat.app.AppCompatActivity; import android.content.res.Configuration; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.View; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void GetScreenSize(View view) { if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) { Toast.makeText(this, "Large screen", Toast.LENGTH_LONG).show(); } else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) { Toast.makeText(this, "Normal sized screen", Toast.LENGTH_LONG).show(); } else if ((getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) { Toast.makeText(this, "Small sized screen", Toast.LENGTH_LONG).show(); } else { Toast.makeText(this, "Screen size is neither large, normal or small", Toast.LENGTH_LONG).show(); } } public void GetScreenDensity(View view) { DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); int density = metrics.densityDpi; if (density == DisplayMetrics.DENSITY_HIGH) { Toast.makeText(this, "DENSITY_HIGH... Density is " + (density), Toast.LENGTH_LONG).show(); } else if (density == DisplayMetrics.DENSITY_MEDIUM) { Toast.makeText(this, "DENSITY_MEDIUM... Density is " + (density), Toast.LENGTH_LONG).show(); } else if (density == DisplayMetrics.DENSITY_LOW) { Toast.makeText(this, "DENSITY_LOW... Density is " + (density), Toast.LENGTH_LONG).show(); } else { Toast.makeText(this, "Density is neither HIGH, MEDIUM OR LOW. Density is " + (density), Toast.LENGTH_LONG).show(); } } }
步骤 4 - 将以下代码添加到 androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将实际的 Android 移动设备连接到您的计算机。要从 Android Studio 运行应用程序,请打开项目中的一个 activity 文件,然后单击运行 工具栏中的图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕 -
点击 这里 下载项目代码。
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