Android NDK:如何在本地二进制文件中获取屏幕分辨率?
创始人
2024-08-14 20:00:20
0

要在Android NDK中获取屏幕分辨率,您可以使用JNI接口访问Java的DisplayMetrics类。以下是一个示例代码,演示如何在本地二进制文件中获取屏幕分辨率:

  1. 首先,在您的Java代码中创建一个方法来获取屏幕分辨率:
import android.content.Context;
import android.util.DisplayMetrics;
import android.view.WindowManager;

public class ScreenUtils {
    public static int[] getScreenResolution(Context context) {
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics metrics = new DisplayMetrics();
        windowManager.getDefaultDisplay().getMetrics(metrics);
        int[] resolution = new int[2];
        resolution[0] = metrics.widthPixels;
        resolution[1] = metrics.heightPixels;
        return resolution;
    }
}
  1. 在您的C/C++代码中,通过JNI接口调用Java代码:
#include 

extern "C" JNIEXPORT jintArray JNICALL
Java_com_example_myapplication_ScreenUtils_getScreenResolution(JNIEnv* env, jobject jobj, jobject context) {
    jclass cls_context = env->GetObjectClass(context);
    jmethodID mid_getSystemService = env->GetMethodID(cls_context, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
    jstring window_service = env->NewStringUTF("window");
    jobject window_manager = env->CallObjectMethod(context, mid_getSystemService, window_service);

    jclass cls_window_manager = env->GetObjectClass(window_manager);
    jmethodID mid_getDefaultDisplay = env->GetMethodID(cls_window_manager, "getDefaultDisplay", "()Landroid/view/Display;");
    jobject display = env->CallObjectMethod(window_manager, mid_getDefaultDisplay);

    jclass cls_display = env->GetObjectClass(display);
    jmethodID mid_getMetrics = env->GetMethodID(cls_display, "getMetrics", "(Landroid/util/DisplayMetrics;)V");

    jobject metrics = env->NewObject(cls_display, mid_getMetrics);

    env->CallVoidMethod(display, mid_getMetrics, metrics);

    jclass cls_display_metrics = env->GetObjectClass(metrics);
    jfieldID fid_widthPixels = env->GetFieldID(cls_display_metrics, "widthPixels", "I");
    jfieldID fid_heightPixels = env->GetFieldID(cls_display_metrics, "heightPixels", "I");

    jintArray resolution = env->NewIntArray(2);
    jint* resolutionArray = env->GetIntArrayElements(resolution, NULL);
    resolutionArray[0] = env->GetIntField(metrics, fid_widthPixels);
    resolutionArray[1] = env->GetIntField(metrics, fid_heightPixels);
    env->ReleaseIntArrayElements(resolution, resolutionArray, 0);

    return resolution;
}
  1. 在您的Java代码中,通过JNI接口调用C/C++代码:
public class MainActivity extends AppCompatActivity {
    static {
        System.loadLibrary("native-lib");
    }

    public native int[] getScreenResolution(Context context);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        int[] resolution = getScreenResolution(this);
        int width = resolution[0];
        int height = resolution[1];

        // 在这里使用分辨率数据
    }
}

通过使用以上代码,您可以在Android NDK中获取屏幕分辨率。请注意,您需要在AndroidManifest.xml文件中添加相应的权限以访问屏幕信息:


希望对您有所帮助!

相关内容

热门资讯

透视有挂!aapoker如何设... 透视有挂!aapoker如何设置胜率(透视)发牌逻辑(都是真的有挂)1、透视有挂!aapoker如何...
透视辅助!德普之星怎么设置埋牌... 透视辅助!德普之星怎么设置埋牌(透视)透视辅助软件下载(竟然是有挂)1、超多福利:超高返利,海量正版...
透视辅助!aapoker插件下... 透视辅助!aapoker插件下载(透视)插件下载(一直真的是有挂)1、全新机制【aapoker插件下...
透视好牌!德普之星透视辅助软件... 透视好牌!德普之星透视辅助软件是真的吗(透视)私人局辅助免费(一贯有挂);1、德普之星透视辅助软件是...
透视数据!aapoker脚本(... 透视数据!aapoker脚本(透视)插件下载(其实是真的有挂)1、透视数据!aapoker脚本(透视...
透视安装!德普之星透视(透视)... 透视安装!德普之星透视(透视)透视挂(本来存在有挂)在进入德普之星透视辅助挂后,参与本局比赛的八名玩...
透视app“哈糖大菠萝攻略”透... 透视app“哈糖大菠萝攻略”透视辅助机制(果然是真的有挂)1、起透看视 哈糖大菠萝攻略透明视辅助2、...
透视插件!德普之星透视辅助软件... 透视插件!德普之星透视辅助软件是真的吗,(德普之星)真是真的是有挂,微扑克教程(有挂插件);1、德普...
透视游戏“德州透视插件”透视辅... 透视游戏“德州透视插件”透视辅助软件(一贯是真的有挂);1、操作简单,无需注册,只需要使用手机进行登...
透视app!德扑圈有透视吗,德... 透视app!德扑圈有透视吗,德普辅助软件,可靠教程(有挂黑科技);1、在德扑圈有透视吗ai机器人技巧...