Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivity(discoverableIntent);
// Create a BroadcastReceiver for ACTION_FOUND
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
mArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
}
};
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy
주의: 새 Bluetooth 디바이스를 발견하는 일은 꽤 무거운 작업이고, 리소스를 많이 소비한다. 따라서 연결할 디바이스를 찾았다면 확실히 하기 위해서 cancelDiscovery() 를 호출해서 discovery 작업을 중지시켜야한다. 또한 이미 디바이스가 연결된 상태에서 discovery 작업을 할 경우 사용 가능한 대역폭이 아주 많이 감소하게 되므로 주의해야한다.
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
void android.app.Activity.startActivityForResult(Intent intent, int requestCode) void android.app.Activity.onActivityResult(int requestCode, int resultCode, Intent data)
package com.example.helloworld;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bbb = (Button) findViewById(R.id.button1);
bbb.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v)
{
Button btn = (Button) findViewById(R.id.button1);
btn.setText("Hello Android");
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
package com.example.helloworld;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initialize();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private void initialize() {
// TODO Auto-generated method stub
Button btn = (Button) findViewById(R.id.button1);
btn.setOnClickListener(this);
}
public void onClick(View v)
{
switch(v.getId())
{
case R.id.button1:
onButton1_click();
break;
}
}
private void onButton1_click() {
// TODO Auto-generated method stub
Button btn = (Button) findViewById(R.id.button1);
btn.setText("Hello");
}
}
Phoronix라는 좀 유명한 리눅스 관련 사이트에 올라온 글입니다.
MIT 대학에서 ODROID-X에 Kernel 3.6과 Ubuntu를 올려서 벤치마킹을 하였습니다.
20여종의 다양한 벤치마킹이 수행되었으며, OMAP4나 TEGRA3에 비해 모든 분야에서 우월한 결과를 보여줍니다.
6페이지 거쳐 자세한 리뷰와 비교가 있으니 참고해 보세요.
Phoronix 사이트가 요즘 많이 느려졌으므로 인내심을 갖고 봐야 합니다.
CC=g++
CFLAGS=-c -Wall
LDFLAGS=
SOURCES=main.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=a.out
all: $(SOURCES) $(EXECUTABLE)
$(EXECUTABLE): $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) -o $@
.cpp.o:
$(CC) $(CFLAGS) $< -o $@
clean:
rm -f $(OBJECTS)
CC=g++
CFLAGS=-c -Wall
SOURCES=name.cpp
OBJECTS=$(SOURCES:.cpp=.o)
TARGET=libXxx
all: $(SOURCES) $(TARGET)
$(TARGET): $(OBJECTS)
ar cr $(TARGET).a $(OBJECTS)
.cpp.o:
$(CC) $(CFLAGS) $< -o $@
clean:
rm -f $(OBJECTS) $(TARGET).a
#This is prefix for the cross compiler #Example: arm-linux- CROSS_COMPILE ?= arm-linux- CC=$(CROSS_COMPILE)gcc CXX=$(CROSS_COMPILE)g++ CFLAGS=-c -Wall LDFLAGS= SOURCES=main.cpp OBJECTS=$(SOURCES:.cpp=.o) EXECUTABLE=a.out all: $(SOURCES) $(EXECUTABLE) $(EXECUTABLE): $(OBJECTS) $(CXX) $(LDFLAGS) $(OBJECTS) -o $@ .cpp.o: $(CXX) $(CFLAGS) $< -o $@ clean: rm -f $(OBJECTS)
#include#include void showUsage(char* progname) { printf("Usage: %s [option]\n", progname); printf("\t-f option\n"); } int main(int argc, char**argv) { if(argc < 2) { showUsage(argv[0]); return 0; } int opt; while( (opt=getopt(argc, argv, "hf:")) != -1) { switch(opt) { case 'h': showUsage(argv[0]); break; case 'f': printf("option is %s\n", optarg); break; } } return 0; }
make menuconfig
CPU Power Management --->
CPU Frequency scaling --->
Default CPUFreq governor (performance) --->
* 'ondemand' 를 'performance' 로 바꿔서 빌드후 적용
echo 1 > /sys/devices/system/cpu/cpu1/online
ssh-keygen -t rsa
make tegra3_android_defconfig make
export CROSS_COMPILE=arm-none-eabi-
export PATH=/path/to/toolchain/bin:$PATH
export ARCH=arm
export SUBARCH=arm
$ repo sync
Fetching projects: 100% (294/294), done.
error: Exited sync due to gc errors
sudo add-apt-repository ppa:git-core/ppa
sudo apt-get update
sudo apt-get install git