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package android.app;
import dalvik.system.PathClassLoader;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import java.io.File;
/**
* Convenience for implementing an activity that will be implemented
* purely in native code. That is, a game (or game-like thing).
*/
public class NativeActivity extends Activity {
public static final String META_DATA_LIB_NAME = "android.app.lib_name";
private int mNativeHandle;
private native int loadNativeCode(String path);
private native void unloadNativeCode(int handle);
private native void onStartNative(int handle);
private native void onResumeNative(int handle);
private native void onSaveInstanceStateNative(int handle);
private native void onPauseNative(int handle);
private native void onStopNative(int handle);
private native void onLowMemoryNative(int handle);
private native void onWindowFocusChangedNative(int handle, boolean focused);
@Override
protected void onCreate(Bundle savedInstanceState) {
String libname = "main";
ActivityInfo ai;
try {
ai = getPackageManager().getActivityInfo(
getIntent().getComponent(), PackageManager.GET_META_DATA);
if (ai.metaData != null) {
String ln = ai.metaData.getString(META_DATA_LIB_NAME);
if (ln != null) libname = ln;
}
} catch (PackageManager.NameNotFoundException e) {
throw new RuntimeException("Error getting activity info", e);
}
String path = null;
if ((ai.applicationInfo.flags&ApplicationInfo.FLAG_HAS_CODE) == 0) {
// If the application does not have (Java) code, then no ClassLoader
// has been set up for it. We will need to do our own search for
// the native code.
path = ai.applicationInfo.dataDir + "/lib/" + System.mapLibraryName(libname);
if (!(new File(path)).exists()) {
path = null;
}
}
if (path == null) {
path = ((PathClassLoader)getClassLoader()).findLibrary(libname);
}
if (path == null) {
throw new IllegalArgumentException("Unable to find native library: " + libname);
}
mNativeHandle = loadNativeCode(path);
if (mNativeHandle == 0) {
throw new IllegalArgumentException("Unable to load native library: " + path);
}
super.onCreate(savedInstanceState);
}
@Override
protected void onDestroy() {
unloadNativeCode(mNativeHandle);
super.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
onLowMemoryNative(mNativeHandle);
}
@Override
protected void onPause() {
super.onPause();
onPauseNative(mNativeHandle);
}
@Override
protected void onResume() {
super.onResume();
onResumeNative(mNativeHandle);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
onSaveInstanceStateNative(mNativeHandle);
}
@Override
protected void onStart() {
super.onStart();
onStartNative(mNativeHandle);
}
@Override
protected void onStop() {
super.onStop();
onStopNative(mNativeHandle);
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
onWindowFocusChangedNative(mNativeHandle, hasFocus);
}
}
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