我试图让 TalkBack 阅读进度条上的进度，但运气不佳。关于如何获取该信息以便 TalkBack 可以说出来的任何想法。
谢谢
公共(public)类 MainActivity 扩展 Activity {
Button btnStartProgress;
ProgressDialog progressBar;
private int progressBarStatus = 0;
private Handler progressBarHandler = new Handler();
private long fileSize = 0;
private String msgProgress ="";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();
}
public void addListenerOnButton() {
btnStartProgress = (Button) findViewById(R.id.btnStartProgress);
btnStartProgress.setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
// prepare for a progress bar dialog
progressBar = new ProgressDialog(v.getContext());
progressBar.setCancelable(true);
progressBar.setMessage("File downloading ...");
progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressBar.setProgress(0);
progressBar.setMax(100);
progressBar.show();
//reset progress bar status
progressBarStatus = 0;
//reset filesize
fileSize = 0;
new Thread(new Runnable() {
public void run() {
while (progressBarStatus < 100) {
// process some tasks
progressBarStatus = doSomeTasks();
// your computer is too fast, sleep 1 second
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// Update the progress bar
progressBarHandler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressBarStatus);
//progressBar.setMessage(msgProgress);
}
});
}
// ok, file is downloaded,
if (progressBarStatus >= 100) {
// sleep 2 seconds, so that you can see the 100%
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// close the progress bar dialog
progressBar.dismiss();
}
}
}).start();
}
});
}
// file download simulator... a really simple
public int doSomeTasks() {
while (fileSize <= 1000000) {
fileSize++;
if (fileSize == 250000) {
//msgProgress = "25 Percent";
return 25;
} else if (fileSize == 500000) {
//msgProgress = "50 Percent";
return 50;
} else if (fileSize == 750000) {
//msgProgress = "75 Percent";
return 75;
} else if (fileSize == 900000) {
//msgProgress = "90 Percent";
return 90;
}
// ...add your own
}
return 100;
}
最佳答案
如前所述here可以创建一个 TTS 单例并添加一个方法来检查是否启用了辅助功能。每次显示进度条时调用方法 say(message)。
我是这样实现的
public class AccessibilityUtil implements OnInitListener {
private static final String TAG = AccessibilityUtil.class.getSimpleName();
private static final AccessibilityUtil instance = new AccessibilityUtil();
private String message;
private static TextToSpeech tts=null;
private static boolean isAccesibilityEnabled() {
return ((AccessibilityManager) TmcPlusApplication.getInstance()
.getSystemService(
TmcPlusApplication.getInstance().ACCESSIBILITY_SERVICE))
.isEnabled();
}
public static AccessibilityUtil getInstance() {
return instance;
}
public void say(String message) {
if (isAccesibilityEnabled()) {
if (tts == null) {
this.message = message;
tts = new TextToSpeech(<Your Application object>.getInstance(), (AccessibilityUtil) instance);
} else {
speakOut();
}
}
}
@Override
public void onInit(int status) {
if (status == TextToSpeech.SUCCESS) {
Log.v(TAG, "Text to speech enabled");
speakOut();
}
}
/*
* utters the message String
*/
private void speakOut() {
Log.v(TAG, "Text to speech the word "+message);
tts.speak(message, TextToSpeech.QUEUE_FLUSH, null);
}
public void stopTTS() {
if (tts != null) {
tts.shutdown();
tts.stop();
tts = null;
}
}
当你调用 say() 方法时，它看起来像这样
AccessibilityUtil.getInstance().say("Loading. Please wait");
希望对你有帮助
关于android-progressbar - 如何让 TalkBack 读取 Android progressBar 进度？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16021624/