我的小安卓项目需要一些帮助。 所以，我必须在一个线程中收集数据。我已经创建了一个线程和处理程序来向ui线程发送消息。这适用于简单的活动。 但问题出现了：我想以不同的方式显示数据：“实时数据”=在文本视图中，数据在图表中，以及之前的（历史数据）。 因此，为此，我创建了一个带有3个片段的标签式活动（一个用于实时数据，一个用于图表，一个用于historycal图表）。但是所有这些片段都需要来自我的线程的相同数据（除了需要最后5-10的最后一个片段，我不知道有多少数据）。 那么我应该从哪里开始阅读？我有什么选择？我应该在这些片段中使用相同的处理程序吗？如果是，我该如何引用它们？或者我必须让我有点困惑，请帮助我。
这是“主要”选项卡式活动（请注意，来自该主题的消息是虚拟数据）：
public class ThermoMeasurementActivity extends AppCompatActivity {
private final int SENSOR_POS_BOTTOM = 0x00;
private final int SENSOR_POS_TOP = 0xFF;
private Handler handler;
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_thermo_measurement);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
handler = new Handler() {
public void handleMessage(Message msg) {
String aResponse = msg.getData().getString("message");
if ((null != aResponse)) {
Log.d("mytag", "Temp = " + aResponse);
}
else
{
Log.d("mytag", "Temp = " + aResponse);
}
}
};
ThermoReaderTask thermoReaderTask = new ThermoReaderTask(handler, SENSOR_POS_BOTTOM, 1000);
thermoReaderTask.start();
ThermoReaderTask thermoReaderTask2 = new ThermoReaderTask(handler, SENSOR_POS_TOP, 1000);
thermoReaderTask2.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_thermo_measurement, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
ThermoMeter tabThermoMeter = new ThermoMeter();
return tabThermoMeter;
case 1:
RealTimeThermoChart rtThermoChart = new RealTimeThermoChart();
return rtThermoChart;
case 2:
HistoryChart historyChart = new HistoryChart();
return historyChart;
default:
return null;
}
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Thermo Meter";
case 1:
return "Real Time Chart";
case 2:
return "History Chart";
}
return null;
}
}
public class ThermoReaderTask extends Thread
{
private Handler handler;
int looptime;
int sensorPos;
ThermoReaderTask(Handler handler, int sensorPos, int looptime)
{
this.handler = handler;
this.looptime = looptime;
this.sensorPos = sensorPos;
}
@Override
public void run() {
try {
while(true) {
String msg = "error";
if(sensorPos == SENSOR_POS_BOTTOM)
{
msg = "BOTTOM TEMP = 28";
}else if(sensorPos == SENSOR_POS_TOP)
{
msg = "TOP TEMP = 28";
}
Message msgObj = handler.obtainMessage();
Bundle b = new Bundle();
b.putString("message", msg);
msgObj.setData(b);
handler.sendMessage(msgObj);
sleep(looptime);
}
} catch (Throwable t) {
}
}
}
}
这里有一个片段（请注意，评论的部分只是尝试）：
public class ThermoMeter extends Fragment implements
CompoundButton.OnCheckedChangeListener {
private int TEMP_MODE_TOP = 0x00;
private int TEMP_MODE_BOTTOM = 0x00;
private final int SENSOR_POS_BOTTOM = 0x00;
private final int SENSOR_POS_TOP = 0xFF;
private ImageView imgvUnitTop;
private ImageView imgvUnitBottom;
private ToggleButton tbTempTop;
private ToggleButton tbTempBottom;
private Handler handler;
private TextView tvTempTop;
private TextView tvTempBottom;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.tab1thermometer, container, false);
imgvUnitTop = (ImageView)rootView.findViewById(R.id.imgvTop);
tbTempTop = (ToggleButton)rootView.findViewById(R.id.tbTempTop);
imgvUnitBottom = (ImageView)rootView.findViewById(R.id.imgvBottom);
tbTempBottom = (ToggleButton)rootView.findViewById(R.id.tbTempBottom);
tbTempBottom.setOnCheckedChangeListener(this);
tbTempTop.setOnCheckedChangeListener(this);
tvTempTop = (TextView)rootView.findViewById(R.id.tvTempTop);
tvTempBottom = (TextView)rootView.findViewById(R.id.tvTempBottom);
/*handler = new Handler() {
public void handleMessage(Message msg) {
String aResponse = msg.getData().getString("message");
if ((null != aResponse)) {
Log.d("mytag", "Temp = " + aResponse);
}
else
{
Log.d("mytag", "Temp = " + aResponse);
}
}
};*/
/* ThermoReaderTask thermoReaderTask = new ThermoReaderTask(handler, SENSOR_POS_BOTTOM, 1000);
thermoReaderTask.start();
ThermoReaderTask thermoReaderTask2 = new ThermoReaderTask(handler, SENSOR_POS_TOP, 1000);
thermoReaderTask2.start();*/
return rootView;
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (buttonView.getId() == R.id.tbTempTop) {
if(isChecked)
{
TEMP_MODE_TOP = 0x00;
imgvUnitTop.setImageResource(R.drawable.celsius);
}else
{
TEMP_MODE_TOP = 0xFF;
imgvUnitTop.setImageResource(R.drawable.fahrenheit);
}
}
else if(buttonView.getId() == R.id.tbTempBottom){
if(isChecked)
{
TEMP_MODE_BOTTOM = 0x00;
imgvUnitBottom.setImageResource(R.drawable.celsius);
}else
{
TEMP_MODE_BOTTOM = 0xFF;
imgvUnitBottom.setImageResource(R.drawable.fahrenheit);
}
}
}
}
你能给我一些链接，教程，提示吗？