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:
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;
}
}
#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;
}
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!