狠狠撸

Bolts + RetroLambda
2015.11.26

? Bolts-Android
? Design API Based On Bolts
? Retrolabmda
? Refactor

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

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

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

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

?
?
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

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

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?
tcs.setResult(0);?
}?
});?
}?
@Override?
tcs.setResult(1);?
}?
});?
}?
AlertDialog d = builder.create();?
d.show();?
return tcs.getTask();?
}?
}

?
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 {?
return null;?
}?
});
?
Calling API we made
RunnableCB

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

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

gradle
?
? https://github.com/evant/gradle-retrolambda

// 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

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

? Bolts-Android
? Design API Based On Bolts
? Code Example
? Retrolabmda
? Refactor

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);?
@Override?
tcs.setResult(0);?
}?
});?
}?
@Override?
tcs.setResult(1);?
}?
});?
}?
d.show();?
}?
}
->
->

?
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 {?
return null;?
}?
});
?
->

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.setPositiveButton(opt1, (DialogInterface dialog, int which) -> {?
tcs.setResult(0);?
});?
}?
builder.setNegativeButton(opt2, (DialogInterface dialog, int which) -> {?
tcs.setResult(1);?
});?
}?
?
d.show();
?
}
Result 1/2

mDialog.show1(R.string.no_ble_device_available).continueWith(task -> {?
gotoScanPage();?
return null;?
});
Result 2/2

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Retrolambda+bolts

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