我已经搜索了很多类似的问题，但没有运气。如果它不是一个，请不要将其标记为重复。如果需要，请随时帮我改变标题。
我有一个应用程序，它在常规活动之上显示GPS检索活动（格式化为对话框）。我的代码应该格式化对话框，以根据操作流程响应性地更改其按钮。当它开始时，这2个按钮的可见性以编程方式设置为已经消失（已经尝试设置在活动布局中，根本没有差异），然后调用方法来查找GPS定位。如果没有检索到位置，则对话框应该（并且确实）将按钮设置为可见。该对话框要求用户再次尝试或在没有建立位置的情况下继续。如果我选择继续，则对话框将省略其中一个按钮并更改可见文本的文本。如果我选择再次尝试检索位置，则对话框应该再次省略两个按钮，但这不会发生。最疯狂的是当我按下＆＃34;再试一次＆＃34;按钮（仍然显示）第二次，在此毛刺之后，按钮被省略。为什么会这样？
这是我的代码：
private Location mLastLocation;
private Location location;
// boolean flag to toggle periodic location updates
private boolean mRequestingLocationUpdates = false;
// UI elements
private TextView mainMsg;
Chronometer c;
private int count = 0;
private boolean proceed = false;
private Button button1, button2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog_location_retriever);
button1 = (Button) findViewById(R.id.btn_loc_1);
button1.setVisibility(View.GONE);
button2 = (Button) findViewById(R.id.btn_loc_2);
button2.setVisibility(View.GONE);
c = (Chronometer) findViewById(R.id.crono);
c.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
@Override
public void onChronometerTick(Chronometer chronometer) {
if (c.getText().equals("00:05")) {
c.stop();
stopLocationUpdates();
proceed = false;
mainMsg.setText("Try again?");
button1.setVisibility(View.VISIBLE); // This is where they first become visible, here the code works for me.
button2.setVisibility(View.VISIBLE);
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRequestingLocationUpdates = false;
proceed = true;
count = 0;
button1.setVisibility(View.GONE);
button2.setVisibility(View.GONE);
/* Here the code gets crazy! Those couple lines above won't work.
I press button2 one time and the two button's fail to disappear.
Chronometer goes to 0 and starts again. The app will try to find a location again.
If I press button2 a second time, while the chronometer is still counting,
then the buttons disappear and the chronometer resets and start over, as originally intended.
ANOTHER INFO: if I remove the three lines above the button methods, it will work, but the app won't function as intended.*/
togglePeriodicLocationUpdates(); // This code calls a method to control whether the app will start looking for a location or shut the location services.
}
});
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mainMsg.setText("Continue without a defined location.");
button1.setVisibility(View.GONE); // Here the code works no matter what...
button2.setText("Continue");
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
});
}
}
});
mainMsg = (TextView) findViewById(R.id.mainMsg);
// Check availability of google play services
if (checkPlayServices()) {
buildGoogleApiClient();
createLocationRequest();
}
new Timer().schedule(new TimerTask() { // This launches the location finder on timer, so that the user doesn't need to press anything to begin location retrieval
@Override
public void run() {
runOnUiThread(new Thread(new Runnable() {
@Override
public void run() {
togglePeriodicLocationUpdates();
}
}));
}
}, 2000);
}
private void togglePeriodicLocationUpdates() {
if (!mRequestingLocationUpdates) { // Begin search cycle
// Changing the button text
if (count == 0) {
mainMsg.setText("Getting location...");
c.setBase(SystemClock.elapsedRealtime());
}
mRequestingLocationUpdates = true;
// Starting the location updates
startLocationUpdates();
c.start();
Log.d(TAG, "Periodic location updates started!");
} else { // End search cycle
mRequestingLocationUpdates = false;
if (count == -1) {
c.stop();
}
// Stopping the location updates
stopLocationUpdates();
if (proceed & count > 0) {
togglePeriodicLocationUpdates();
}
Log.d(TAG, "Periodic location updates stopped!");
}
}
@Override
public void onLocationChanged(Location location) { // Listener for locations get by the google play location service
if (mLastLocation == null) mLastLocation = location; // checks if first time
try {
if (location.getLatitude() != mLastLocation.getLatitude() &
location.getLongitude() != mLastLocation.getLongitude()) {
/* Seems the location API can the last known location instead of the ACTUAL location.
I didn't like that too much, so I verify if the freshly-collected location is the same as the "last known".
If the location is new.......*/
c.stop(); // Halt the chronometer
stopLocationUpdates(); // Halt location services
// Assign the new location
mLastLocation = location;
this.location = location;
Toast.makeText(getApplicationContext(), "Location changed!", Toast.LENGTH_SHORT).show();
double latitude = location.getLatitude();
double longitude = location.getLongitude();
mRequestingLocationUpdates = false;
// This is supposed to be the last snippet of location code to run...
} else {
// This should run if the location found is not an actual update on your position.
// For your information, this runs in cycles, half dozen or so if the (GPRS) signal is poor.
mainMsg.setText("Text to keep user entertained...");
if (!proceed) {
proceed = !proceed;
}
count++; // Variable to count the number of cycles run
togglePeriodicLocationUpdates(); // Call the toggle function again to run another cycle
// Running those cycles seemed to help my GPS to find a location, instead of just leaving it on all the time.
}
} catch (NullPointerException e) {
c.stop();
e.printStackTrace();
}
}
我的布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical|center_horizontal"
android:orientation="vertical"
tools:context="br.com.gerpaudit.activity.LocationRetrieverActivity"
android:paddingTop="20sp"
android:paddingBottom="20sp">
<TextView
android:id="@+id/mainMsg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:text="O aplicativo irá buscar sua localização, aguarde."
android:gravity="center_vertical|center_horizontal"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Tempo decorrido: "
android:id="@+id/textView"
android:textStyle="bold"
android:textSize="25sp"/>
<Chronometer
android:id="@+id/crono"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:allowUndo="false"
android:textSize="25sp"
android:textStyle="bold"
/>
</LinearLayout>
<LinearLayout
android:id="@+id/loc_btn_layout"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical|center_horizontal"
android:paddingLeft="5dp"
android:paddingRight="5dp">
<Button
android:id="@+id/btn_loc_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:background="@drawable/bg_voltar"
android:text="Não"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:visibility="visible"/>
<Button
android:id="@+id/btn_loc_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:background="@drawable/bg_voltar"
android:text="Sim"
android:layout_weight="1"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:visibility="visible"/>
</LinearLayout>
答案 0 :(得分：1)
尝试删除
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRequestingLocationUpdates = false;
proceed = true;
count = 0;
button1.setVisibility(View.GONE);
button2.setVisibility(View.GONE);
/* Here the code gets crazy! Those couple lines above won't work.
I press button2 one time and the two button's fail to disappear.
Chronometer goes to 0 and starts again. The app will try to find a location again.
If I press button2 a second time, while the chronometer is still counting,
then the buttons disappear and the chronometer resets and start over, as originally intended.
ANOTHER INFO: if I remove the three lines above the button methods, it will work, but the app won't function as intended.*/
togglePeriodicLocationUpdates(); // This code calls a method to control whether the app will start looking for a location or shut the location services.
}
});
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mainMsg.setText("Continue without a defined location.");
button1.setVisibility(View.GONE); // Here the code works no matter what...
button2.setText("Continue");
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
});
在if (c.getText().equals("00:05"))语句之后，将它们放在
button1 = (Button) findViewById(R.id.btn_loc_1);
button1.setVisibility(View.GONE);
button2 = (Button) findViewById(R.id.btn_loc_2);
button2.setVisibility(View.GONE);
答案 1 :(得分：0)
原来我需要在更改这些视图的状态之前重置计时器。奇怪的是，我验证了按钮的状态，它们的可见性显示为“8”，即“View.GONE”，但仍然显示。现在我添加了一行来重置Chronometer，然后再将它们设置为GONE，它可以工作。不要问我为什么。