Language: Traditional Chinese Bolts-Android & RetroLambda introduction

1. Bolts + RetroLambda
2015.11.26

2. • Bolts-Android
• Design API Based On Bolts
• Retrolabmda
• Refactor

3. Why use ?
• spec.

4. member func() {
Serialize Asynchronous
Tasks
callback {
callback {
callback{
}
then {
then {
then {
} } } }
member func() {
}
}
}

5. • Bolts-Android
• Design API Based On Bolts
• Retrolabmda
• Refactor

6. Example
show dialog
press
“YES” button Cancel
Do
something
NO
YES

7. Example 1/4
public class RunnableCB implements Runnable {
public void run() {
this.run();
}
}

8. private AlertDialog simpleAlertDialog(String message, final
RunnableCB cb) {
if (cb == null) {
final RunnableCB emptyCallback= new RunnableCB() {
public void run() {
}
};
return buildDialog(message, "OK", emptyCallback);
} else {
return buildDialog(message, "OK", cb);
}
}
Example 2/4

9.
private AlertDialog buildDialog(String message,
String cb1Option, final RunnableCB cb1)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message);
builder.setPositiveButton(cb1Option, new
DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
cb1.run();
}
});
return builder.create();
}
Example 3/4

10.
final RunnableCB cbSwitchOff = new RunnableCB() {
public void run() {
((CompoundButton) bleSwitch).setChecked(false);
}
};
String str =
getResources().getString(R.string.no_ble_device_available);
simpleAlertDialog(str, cbSwitchOff).show();
Example 4/4

11. Refactor with Bolts
public class Dialog {
static Task<Integer> dlg(String msg, String opt1, String opt2) {
final Task<Integer>.TaskCompletionSource tcs = Task.create();
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setMessage(msg);
if (opt1 != null && !opt1.isEmpty()) {
builder.setPositiveButton(opt1, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
tcs.setResult(0);
}
});
}
if (opt2 != null && !opt2.isEmpty()) {
builder.setPositiveButton(opt2, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
tcs.setResult(1);
}
});
}
AlertDialog d = builder.create();
d.show();
return tcs.getTask();
}
}

12.
String str = getResources().getString(R.string.no_ble_device_available);
mDialog.show(str, "OK", null).continueWith(new Continuation<Integer, Void>() {
@Override
public Void then(Task<Integer> task) throws Exception {
((CompoundButton) bleSwitch).setChecked(false);
return null;
}
});
Calling API we made
RunnableCB

13. ,
they !! ( Java)

14. • Bolts-Android
• Design API Based On Bolts
• Retrolabmda
• Refactor

15. What’s Retrolambda
• Back port Java8 to Java 7, 6, 5
• Syntax Sugar ( )
• Good introduction : Ingram Chen http://
ingramchen.io/blog/2014/10/retromlambda.html

16. Retrolambda Limitation
• Does not back port Java 8 APIs
https://docs.oracle.com/javase/8/docs/api/java/
util/function/package-summary.html

17. gradle
•
• https://github.com/evant/gradle-retrolambda

18. // defined in the SDK
interface OnClickListener {
public void onClick(View v);
}
// your code
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// do something here
}
});
syntax sugar 1/2

19. mButton.setOnClickListener((View v) -> {
// do something here
});
syntax sugar 2/2

20. • Bolts-Android
• Design API Based On Bolts
• Code Example
• Retrolabmda
• Refactor

21. public class Dialog {
static Task<Integer> dlg(String msg, String opt1, String opt2) {
final Task<Integer>.TaskCompletionSource tcs = Task.create();
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setMessage(msg);
if (opt1 != null && !opt1.isEmpty()) {
builder.setPositiveButton(opt1, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
tcs.setResult(0);
}
});
}
if (opt2 != null && !opt2.isEmpty()) {
builder.setPositiveButton(opt2, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
tcs.setResult(1);
}
});
}
AlertDialog d = builder.create();
d.show();
return tcs.getTask();
}
}
->
->

22.
String str = getResources().getString(R.string.no_ble_device_available);
mDialog.show(str, "OK", null).continueWith(new Continuation<Integer, Void>() {
@Override
public Void then(Task<Integer> task) throws Exception {
((CompoundButton) bleSwitch).setChecked(false);
return null;
}
});
->

23. public Task<Integer> show(String msg, String opt1, String opt2) {
final Task.TaskCompletionSource tcs = Task.create();
final AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setMessage(msg);
if (opt1 != null && !opt1.isEmpty()) {
builder.setPositiveButton(opt1, (DialogInterface dialog, int which) -> {
tcs.setResult(0);
});
}
if (opt2 != null && !opt2.isEmpty()) {
builder.setNegativeButton(opt2, (DialogInterface dialog, int which) -> {
tcs.setResult(1);
});
}
AlertDialog d = builder.create();
d.show();
return tcs.getTask();
}
Result 1/2

24. mDialog.show1(R.string.no_ble_device_available).continueWith(task -> {
((CompoundButton) bleSwitch).setChecked(false);
gotoScanPage();
return null;
});
Result 2/2