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Some fixes and enhancements for Android
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@katzer
katzer committed Feb 3, 2019
1 parent b5950b5 commit 6b522e9
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Showing 3 changed files with 247 additions and 215 deletions.
228 changes: 112 additions & 116 deletions src/android/BackgroundExt.java
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,6 @@ Licensed to the Apache Software Foundation (ASF) under one
import android.os.Build;
import android.os.PowerManager;
import android.view.View;
import android.view.Window;

import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaInterface;
Expand All @@ -39,121 +38,114 @@ Licensed to the Apache Software Foundation (ASF) under one
import org.apache.cordova.PluginResult;
import org.apache.cordova.PluginResult.Status;

import java.lang.ref.WeakReference;
import java.util.List;

import static android.content.Context.ACTIVITY_SERVICE;
import static android.content.Context.POWER_SERVICE;
import static android.os.Build.VERSION.SDK_INT;
import static android.view.WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON;
import static android.view.WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD;
import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;
import static android.view.WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON;

/**
* Implements extended functions around the main purpose
* of infinite execution in the background.
*/
class BackgroundExt {

// Weak reference to the cordova interface passed by the plugin
private final WeakReference<CordovaInterface> cordova;
// Reference to the cordova interface passed by the plugin
private final CordovaInterface cordova;

// Weak reference to the cordova web view passed by the plugin
private final WeakReference<CordovaWebView> webView;
// Reference to the cordova web view passed by the plugin
private final CordovaWebView webView;

// To keep the device awake
private PowerManager.WakeLock wakeLock;

/**
* Initialize the extension to perform non-background related tasks.
*
* @param plugin The cordova plugin.
*/
private BackgroundExt(CordovaPlugin plugin) {
this.cordova = new WeakReference<CordovaInterface>(plugin.cordova);
this.webView = new WeakReference<CordovaWebView>(plugin.webView);
BackgroundExt(CordovaPlugin plugin)
{
this.cordova = plugin.cordova;
this.webView = plugin.webView;
}

/**
* Executes the request asynchronous.
* Executes the request within a thread.
*
* @param plugin The cordova plugin.
* @param action The action to execute.
* @param callback The callback context used when
* calling back into JavaScript.
*/
@SuppressWarnings("UnusedParameters")
static void execute (CordovaPlugin plugin, final String action,
final CallbackContext callback) {

final BackgroundExt ext = new BackgroundExt(plugin);

plugin.cordova.getThreadPool().execute(new Runnable() {
@Override
public void run() {
ext.execute(action, callback);
}
});
void executeAsync (String action, CallbackContext callback)
{
cordova.getThreadPool().execute(() -> execute(action, callback));
}

// codebeat:disable[ABC]

/**
* Executes the request.
*
* @param action The action to execute.
* @param callback The callback context used when
* calling back into JavaScript.
*/
private void execute (String action, CallbackContext callback) {

if (action.equalsIgnoreCase("optimizations")) {
disableWebViewOptimizations();
}

if (action.equalsIgnoreCase("background")) {
moveToBackground();
}

if (action.equalsIgnoreCase("foreground")) {
moveToForeground();
}

if (action.equalsIgnoreCase("tasklist")) {
excludeFromTaskList();
}

if (action.equalsIgnoreCase("dimmed")) {
isDimmed(callback);
}

if (action.equalsIgnoreCase("wakeup")) {
wakeup();
}

if (action.equalsIgnoreCase("unlock")) {
wakeup();
unlock();
private void execute (String action, CallbackContext callback)
{
switch (action)
{
case "optimizations":
disableWebViewOptimizations();
break;
case "background":
moveToBackground();
break;
case "foreground":
moveToForeground();
break;
case "tasklist":
excludeFromTaskList();
break;
case "dimmed":
isDimmed(callback);
break;
case "wakeup":
wakeup();
break;
case "unlock":
wakeup();
unlock();
break;
}
}

// codebeat:enable[ABC]

/**
* Move app to background.
* Moves the app to the background.
*/
private void moveToBackground() {
private void moveToBackground()
{
Intent intent = new Intent(Intent.ACTION_MAIN);

intent.addCategory(Intent.CATEGORY_HOME);

getApp().startActivity(intent);
}

/**
* Move app to foreground.
* Moves the app to the foreground.
*/
private void moveToForeground() {
private void moveToForeground()
{
Activity app = getApp();
Intent intent = getLaunchIntent();

intent.addFlags(
Intent.FLAG_ACTIVITY_REORDER_TO_FRONT |
Intent.FLAG_ACTIVITY_SINGLE_TOP);
Intent.FLAG_ACTIVITY_SINGLE_TOP |
Intent.FLAG_ACTIVITY_CLEAR_TOP);

app.startActivity(intent);
}
Expand All @@ -166,18 +158,15 @@ private void disableWebViewOptimizations() {
public void run() {
try {
Thread.sleep(1000);
getApp().runOnUiThread(new Runnable() {
@Override
public void run() {
View view = webView.get().getEngine().getView();

try {
Class.forName("org.crosswalk.engine.XWalkCordovaView")
.getMethod("onShow")
.invoke(view);
} catch (Exception e){
view.dispatchWindowVisibilityChanged(View.VISIBLE);
}
getApp().runOnUiThread(() -> {
View view = webView.getEngine().getView();

try {
Class.forName("org.crosswalk.engine.XWalkCordovaView")
.getMethod("onShow")
.invoke(view);
} catch (Exception e){
view.dispatchWindowVisibilityChanged(View.VISIBLE);
}
});
} catch (InterruptedException e) {
Expand All @@ -190,13 +179,14 @@ public void run() {
}

/**
* Exclude the app from the recent tasks list.
* Excludes the app from the recent tasks list.
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void excludeFromTaskList() {
private void excludeFromTaskList()
{
ActivityManager am = (ActivityManager) getService(ACTIVITY_SERVICE);

if (am == null || Build.VERSION.SDK_INT < 21)
if (am == null || SDK_INT < 21)
return;

List<AppTask> tasks = am.getAppTasks();
Expand All @@ -208,24 +198,29 @@ private void excludeFromTaskList() {
}

/**
* Invoke the callback with information if the screen is on.
* Invokes the callback with information if the screen is on.
*
* @param callback The callback to invoke.
*/
@SuppressWarnings("deprecation")
private void isDimmed(CallbackContext callback) {
PluginResult result = new PluginResult(Status.OK, isDimmed());
callback.sendPluginResult(result);
private void isDimmed (CallbackContext callback)
{
boolean status = isDimmed();
PluginResult res = new PluginResult(Status.OK, status);

callback.sendPluginResult(res);
}

/**
* If the screen is active.
* Returns if the screen is active.
*/
@SuppressWarnings("deprecation")
private boolean isDimmed() {
private boolean isDimmed()
{
PowerManager pm = (PowerManager) getService(POWER_SERVICE);

if (Build.VERSION.SDK_INT < 20) {
if (SDK_INT < 20)
{
return !pm.isScreenOn();
}

Expand All @@ -235,7 +230,8 @@ private boolean isDimmed() {
/**
* Wakes up the device if the screen isn't still on.
*/
private void wakeup() {
private void wakeup()
{
try {
acquireWakeLock();
} catch (Exception e) {
Expand All @@ -246,72 +242,74 @@ private void wakeup() {
/**
* Unlocks the device even with password protection.
*/
private void unlock() {
Intent intent = getLaunchIntent();
getApp().startActivity(intent);
private void unlock()
{
getApp().runOnUiThread(() -> {
addSreenAndKeyguardFlags();
getApp().startActivity(getLaunchIntent());
});
}

/**
* Acquire a wake lock to wake up the device.
* Acquires a wake lock to wake up the device.
*/
private void acquireWakeLock() {
@SuppressWarnings("deprecation")
private void acquireWakeLock()
{
PowerManager pm = (PowerManager) getService(POWER_SERVICE);

releaseWakeLock();

if (!isDimmed()) {
if (!isDimmed())
return;
}

int level = PowerManager.SCREEN_DIM_WAKE_LOCK |
PowerManager.ACQUIRE_CAUSES_WAKEUP;

wakeLock = pm.newWakeLock(level, "BackgroundModeExt");
wakeLock = pm.newWakeLock(level, "backgroundmode:wakelock");
wakeLock.setReferenceCounted(false);
wakeLock.acquire(1000);
}

/**
* Releases the previously acquire wake lock.
*/
private void releaseWakeLock() {
private void releaseWakeLock()
{
if (wakeLock != null && wakeLock.isHeld()) {
wakeLock.release();
wakeLock = null;
}
}

/**
* Add required flags to the window to unlock/wakeup the device.
* Adds required flags to the window to unlock/wakeup the device.
*/
static void addWindowFlags(Activity app) {
final Window window = app.getWindow();
private void addSreenAndKeyguardFlags()
{
getApp().getWindow().addFlags(FLAG_ALLOW_LOCK_WHILE_SCREEN_ON | FLAG_SHOW_WHEN_LOCKED | FLAG_TURN_SCREEN_ON | FLAG_DISMISS_KEYGUARD);
}

app.runOnUiThread(new Runnable() {
public void run() {
window.addFlags(
FLAG_ALLOW_LOCK_WHILE_SCREEN_ON |
FLAG_SHOW_WHEN_LOCKED |
FLAG_TURN_SCREEN_ON |
FLAG_DISMISS_KEYGUARD
);
}
});
/**
* Removes required flags to the window to unlock/wakeup the device.
*/
static void clearKeyguardFlags (Activity app)
{
app.runOnUiThread(() -> app.getWindow().clearFlags(FLAG_DISMISS_KEYGUARD));
}

/**
* The activity referenced by cordova.
*
* @return The main activity of the app.
* Returns the activity referenced by cordova.
*/
Activity getApp() {
return cordova.get().getActivity();
return cordova.getActivity();
}

/**
* The launch intent for the main activity.
* Gets the launch intent for the main activity.
*/
private Intent getLaunchIntent() {
private Intent getLaunchIntent()
{
Context app = getApp().getApplicationContext();
String pkgName = app.getPackageName();

Expand All @@ -322,11 +320,9 @@ private Intent getLaunchIntent() {
* Get the requested system service by name.
*
* @param name The name of the service.
*
* @return The service instance.
*/
private Object getService(String name) {
private Object getService(String name)
{
return getApp().getSystemService(name);
}

}
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