我不知道为什么，但我的应用程序突然一直强行关闭我。它早些时候工作正常。
请看一下。
public class AgentPortalActivity extends Activity implements OnClickListener {
String username;
String password;
Button login;
EditText uid;
EditText pwd;
CheckBox chkRememberPassword;
SharedPreferences loginPreferences;
SharedPreferences.Editor loginPrefsEditor;
Boolean saveLogin;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// User Id and Password Text Fields
uid = (EditText) findViewById(R.id.uid);
pwd = (EditText) findViewById(R.id.pw);
// Converts the Text in the User Id and Password field to Strings
username = uid.getText().toString();
password = pwd.getText().toString();
// Login Button On Click Listener
login = (Button) findViewById(R.id.login);
login.setOnClickListener(this);
// Remember Password Save Properties
chkRememberPassword = (CheckBox) findViewById(R.id.chkRememberPassword);
loginPreferences = getSharedPreferences("loginPrefs", MODE_PRIVATE);
loginPrefsEditor = loginPreferences.edit();
saveLogin = loginPreferences.getBoolean("saveLogin", false);
if (saveLogin == true) {
uid.setText(loginPreferences.getString(username, ""));
pwd.setText(loginPreferences.getString(password, ""));
chkRememberPassword.setChecked(true);
// End
}
}
public void onClick(View view) {
if (view == login) {
// Loading Dialog Box
final ProgressDialog dialog = new ProgressDialog(
AgentPortalActivity.this);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setMessage("Logging In...");
dialog.show();
Thread t = new Thread(new Runnable() {
public void run() {
while (dialog.getProgress() < dialog.getMax()) {
try {
Thread.sleep(50);
} catch (Exception e) {/* no-op */
}
}
dialog.dismiss();
}
});
t.start();
// End Of Loading Dialog Box
// Hides Soft Keyboard
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(uid.getWindowToken(), 0);
imm.hideSoftInputFromWindow(pwd.getWindowToken(), 0);
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
// Send username and password strings into screen1 class
Intent i = new Intent(this, screen1.class);
i.putExtra("uid", username);
i.putExtra("pwd", password);
startActivity(i);
// End
if (chkRememberPassword.isChecked()) {
loginPrefsEditor.putBoolean("saveLogin", true);
loginPrefsEditor.putString(username, username);
loginPrefsEditor.putString(password, password);
loginPrefsEditor.commit();
} else {
loginPrefsEditor.clear();
loginPrefsEditor.commit();
}
doSomethingElse();
}
}
public void doSomethingElse() {
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}
}
继承我的第二堂课
public class screen1 extends Activity implements View.OnClickListener {
String username;
String password;
// EditTexts
final EditText milein = (EditText) findViewById(R.id.milein);
final EditText zipin = (EditText) findViewById(R.id.zipin);
final EditText mileout = (EditText) findViewById(R.id.mileout);
final EditText zipout = (EditText) findViewById(R.id.zipout);
final EditText feed = (EditText) findViewById(R.id.feed);
// TextViews
final TextView dispatch = (TextView) findViewById(R.id.dispatch);
final TextView dispatchnum = (TextView) findViewById(R.id.dispatchnum);
final TextView csr = (TextView) findViewById(R.id.csr);
final TextView csrnum = (TextView) findViewById(R.id.csrnum);
final TextView it = (TextView) findViewById(R.id.it);
final TextView itnum = (TextView) findViewById(R.id.itnum);
final TextView thoughts = (TextView) findViewById(R.id.thoughts);
final TextView information = (TextView) findViewById(R.id.information);
//ToggleButtons
final ToggleButton checkinbutton = (ToggleButton) findViewById(R.id.checkinbutton);
// Buttons
final Button submit = (Button) findViewById(R.id.submit);
final Button send = (Button) findViewById(R.id.send);
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screen1);
// Calls String from AgentPortalActivity class to pass through to
// screen1 class
Intent i = getIntent();
username = i.getExtras().getString("uid");
password = i.getExtras().getString("pwd");
// End
// Passes username and password strings and inserts into URL for login
// and pwd
JSONObject json = JSONfunction
.getJSONfromURL("http://whatever.com/api/?type=json&uid="
+ (username) + "&pwd=" + (password));
// End
try {
// boolean suspended = json.getBoolean("suspended");
String firstName = json.getString("firstName");
String lastName = json.getString("lastName");
// int checkdin = json.getInt("checkedin");
// int checkindatetime = json.getInt("checkindatetime");
// Get Json object address
JSONObject address = json.getJSONObject("address");
String streetAddress = address.getString("streetAddress");
String city = address.getString("city");
String state = address.getString("state");
String postalCode = address.getString("postalCode");
// End
// Get PhoneNumber Array
JSONArray phoneNumbers = json.getJSONArray("phoneNumber");
// String type = phoneNumbers.getJSONObject(0).getString("type");
String number = phoneNumbers.getJSONObject(0).getString("number");
// End
information.setText("Hello," + " " + (firstName) + " " + (lastName)
+ "!" + " " + "Your Home Number is" + " " + (number) + " "
+ "Your Address is" + " " + (streetAddress) + " " + (city)
+ " " + (state) + " " + (postalCode));
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
/** Submit Button Invisible Child Properties */
submit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
// Submit Mile-IN Mile-Out Button
if (submit.isPressed()) {
milein.setVisibility(View.GONE);
zipin.setVisibility(View.GONE);
mileout.setVisibility(View.GONE);
zipout.setVisibility(View.GONE);
submit.setVisibility(View.GONE);
dispatch.setVisibility(View.GONE);
dispatchnum.setVisibility(View.GONE);
csr.setVisibility(View.GONE);
csrnum.setVisibility(View.GONE);
it.setVisibility(View.GONE);
itnum.setVisibility(View.GONE);
thoughts.setVisibility(View.GONE);
feed.setVisibility(View.GONE);
send.setVisibility(View.GONE);
// End
// Button OnClick Vibrating Service
Vibrator vib1 = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib1.vibrate(50);
// End
// Toast "Please Wait" Upon Clicking Submit Button
Toast.makeText(getBaseContext(), "Please Wait...",
Toast.LENGTH_SHORT).show();
// End
}
}
});
// Boolean for Check-In Button Sharedpreferences
final SharedPreferences preferences = getPreferences(MODE_PRIVATE);
boolean tgpref = preferences.getBoolean("tgpref", false);
checkinbutton.setChecked(tgpref);
// End
// ToggleButton Check-IN
checkinbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
// End
// Only Displays Mile-in Zip-in and Submit Button
if (checkinbutton.isChecked()) {
milein.setVisibility(View.VISIBLE);
zipin.setVisibility(View.VISIBLE);
submit.setVisibility(View.VISIBLE);
mileout.setVisibility(View.GONE);
zipout.setVisibility(View.GONE);
dispatch.setVisibility(View.GONE);
dispatchnum.setVisibility(View.GONE);
csr.setVisibility(View.GONE);
csrnum.setVisibility(View.GONE);
it.setVisibility(View.GONE);
itnum.setVisibility(View.GONE);
thoughts.setVisibility(View.GONE);
feed.setVisibility(View.GONE);
send.setVisibility(View.GONE);
// End
// Button OnClick Vibrating Service
Vibrator vib1 = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib1.vibrate(50);
// End
Toast.makeText(getBaseContext(), "Checking In...",
Toast.LENGTH_SHORT).show();
// Boolean Preferences for Checkinbutton ToggleButton
// Remembers Toggle State Checked
SharedPreferences.Editor editor = preferences.edit();
final SharedPreferences preferences = getPreferences(MODE_PRIVATE);
boolean tgpref = preferences.getBoolean("tgpref", false);
checkinbutton.setChecked(tgpref);
editor.putBoolean("tgpref", true);
editor.commit();
// End
} else {
mileout.setVisibility(View.VISIBLE);
zipout.setVisibility(View.VISIBLE);
submit.setVisibility(View.VISIBLE);
milein.setVisibility(View.GONE);
zipin.setVisibility(View.GONE);
dispatch.setVisibility(View.GONE);
dispatchnum.setVisibility(View.GONE);
csr.setVisibility(View.GONE);
csrnum.setVisibility(View.GONE);
it.setVisibility(View.GONE);
itnum.setVisibility(View.GONE);
thoughts.setVisibility(View.GONE);
feed.setVisibility(View.GONE);
send.setVisibility(View.GONE);
// Boolean Preferences for Checkinbutton ToggleButton
// Remembers Toggle State Un-Checked
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("tgpref", false);
editor.commit();
// End
// AlertDialog Meal-Periods Button Configurations
final AlertDialog alertDialog = new AlertDialog.Builder(
screen1.this).create();
alertDialog
.setMessage("I hereby verify that I have received all my 10 minute rest periods and 30 minute meal breaks today.");
alertDialog.setButton("Agree",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
Toast.makeText(getBaseContext(),
"Checking Out...",
Toast.LENGTH_SHORT).show();
}
});
alertDialog.setButton2("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
Toast.makeText(
getBaseContext(),
"Please contact Ro*** Mu*** (Human Resource) to report any discrepancies",
Toast.LENGTH_LONG).show();
checkinbutton.setChecked(true);
milein.setVisibility(View.GONE);
zipin.setVisibility(View.GONE);
mileout.setVisibility(View.GONE);
zipout.setVisibility(View.GONE);
submit.setVisibility(View.GONE);
dispatch.setVisibility(View.GONE);
dispatchnum.setVisibility(View.GONE);
csr.setVisibility(View.GONE);
csrnum.setVisibility(View.GONE);
it.setVisibility(View.GONE);
itnum.setVisibility(View.GONE);
thoughts.setVisibility(View.GONE);
feed.setVisibility(View.GONE);
send.setVisibility(View.GONE);
SharedPreferences.Editor editor = preferences
.edit();
editor.putBoolean("tgpref", true);
editor.commit();
}
});
alertDialog.show();
// End
}
};
});
Button statusbutton = (Button) findViewById(R.id.statusbutton);
statusbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
// End
/** Fading Transition Effect */
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
/** Status Bar */
final ProgressDialog dialog = new ProgressDialog(screen1.this);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setMessage("Getting Status Please Wait...");
dialog.show();
Thread t = new Thread(new Runnable() {
public void run() {
while (dialog.getProgress() < dialog.getMax()) {
try {
// Send username and password strings into
// screen1 class
Intent i = new Intent(screen1.this,
statuspage.class);
i.putExtra("uid", username);
i.putExtra("pwd", password);
startActivity(i);
// End
Thread.sleep(50);
} catch (Exception e) {/* no-op */
}
}
dialog.dismiss();
}
});
t.start();
/** End Of Status Bar */
}
});
Button jobs = (Button) findViewById(R.id.jobs);
jobs.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
startActivity(new Intent(screen1.this, Jobs.class));
screen1.this.finish();
/** Fading Transition Effect */
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
/** Status Bar */
final ProgressDialog dialog2 = new ProgressDialog(screen1.this);
dialog2.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog2.setMessage("Loading Jobs Please Wait...");
dialog2.show();
Thread t1 = new Thread(new Runnable() {
public void run() {
while (dialog2.getProgress() < dialog2.getMax()) {
try {
Thread.sleep(50);
} catch (Exception e) {/* no-op */
}
}
dialog2.dismiss();
}
});
t1.start();
/** End Of Status Bar */
}
});
Button contact = (Button) findViewById(R.id.contact);
contact.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
dispatch.setVisibility(View.VISIBLE);
dispatchnum.setVisibility(View.VISIBLE);
csr.setVisibility(View.VISIBLE);
csrnum.setVisibility(View.VISIBLE);
it.setVisibility(View.VISIBLE);
itnum.setVisibility(View.VISIBLE);
milein.setVisibility(View.GONE);
zipin.setVisibility(View.GONE);
mileout.setVisibility(View.GONE);
zipout.setVisibility(View.GONE);
submit.setVisibility(View.GONE);
thoughts.setVisibility(View.GONE);
feed.setVisibility(View.GONE);
send.setVisibility(View.GONE);
}
});
Button feedback = (Button) findViewById(R.id.feedback);
feedback.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
thoughts.setVisibility(View.VISIBLE);
feed.setVisibility(View.VISIBLE);
send.setVisibility(View.VISIBLE);
milein.setVisibility(View.GONE);
zipin.setVisibility(View.GONE);
mileout.setVisibility(View.GONE);
zipout.setVisibility(View.GONE);
submit.setVisibility(View.GONE);
dispatch.setVisibility(View.GONE);
dispatchnum.setVisibility(View.GONE);
csr.setVisibility(View.GONE);
csrnum.setVisibility(View.GONE);
it.setVisibility(View.GONE);
itnum.setVisibility(View.GONE);
}
});
}
@Override
public void onBackPressed() {
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
startActivity(new Intent(screen1.this, AgentPortalActivity.class));
screen1.this.finish();
/** Fading Transition Effect */
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
return;
}
@Override
public void onClick(View v) {
}
}
这是我的LogCat
03-22 09:44:56.031: I/Process(21770): Sending signal. PID: 21770 SIG: 9
03-22 09:44:57.679: D/dalvikvm(21798): GC_EXTERNAL_ALLOC freed 58K, 44% free 3036K/5379K, external 1596K/2108K, paused 35ms
03-22 09:44:57.788: D/dalvikvm(21798): GC_EXTERNAL_ALLOC freed 11K, 44% free 3056K/5379K, external 3498K/3748K, paused 36ms
03-22 09:44:57.804: D/AndroidRuntime(21798): Shutting down VM
03-22 09:44:57.804: W/dalvikvm(21798): threadid=1: thread exiting with uncaught exception (group=0x40015578)
03-22 09:44:57.812: E/AndroidRuntime(21798): FATAL EXCEPTION: main
03-22 09:44:57.812: E/AndroidRuntime(21798): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jetdelivery.mobile/com.jetdelivery.mobile.AgentPortalActivity}: java.lang.NullPointerException
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.os.Handler.dispatchMessage(Handler.java:99)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.os.Looper.loop(Looper.java:130)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.ActivityThread.main(ActivityThread.java:3687)
03-22 09:44:57.812: E/AndroidRuntime(21798): at java.lang.reflect.Method.invokeNative(Native Method)
03-22 09:44:57.812: E/AndroidRuntime(21798): at java.lang.reflect.Method.invoke(Method.java:507)
03-22 09:44:57.812: E/AndroidRuntime(21798): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
03-22 09:44:57.812: E/AndroidRuntime(21798): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
03-22 09:44:57.812: E/AndroidRuntime(21798): at dalvik.system.NativeStart.main(Native Method)
03-22 09:44:57.812: E/AndroidRuntime(21798): Caused by: java.lang.NullPointerException
03-22 09:44:57.812: E/AndroidRuntime(21798): at com.jetdelivery.mobile.AgentPortalActivity.onCreate(AgentPortalActivity.java:40)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-22 09:44:57.812: E/AndroidRuntime(21798): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
03-22 09:44:57.812: E/AndroidRuntime(21798): ... 11 more
03-22 09:45:04.652: I/Process(21798): Sending signal. PID: 21798 SIG: 9
答案 0 :(得分：0)
// Converts the Text in the User Id and Password field to Strings
username = uid.getText().toString();
password = pwd.getText().toString();
These lines正在为您提供NullPointerExcepton。因为当它们不包含任何东西时，你试图从这些edittexts中获取OnCreate（）本身的文本。在onResume（）之前，用户无法查看和交互视图。您需要在onCreate和某些事件触发（例如按钮单击）上关闭这两行和所有其他代码。
试试这个代码。我已将它们移动到onClick（）以给你一个想法：
public class AgentPortalActivity extends Activity implements OnClickListener {
String username;
String password;
Button login;
EditText uid;
EditText pwd;
CheckBox chkRememberPassword;
SharedPreferences loginPreferences;
SharedPreferences.Editor loginPrefsEditor;
Boolean saveLogin;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// User Id and Password Text Fields
uid = (EditText) findViewById(R.id.uid);
pwd = (EditText) findViewById(R.id.pw);
// Login Button On Click Listener
login = (Button) findViewById(R.id.login);
login.setOnClickListener(this);
// Remember Password Save Properties
chkRememberPassword = (CheckBox) findViewById(R.id.chkRememberPassword);
loginPreferences = getSharedPreferences("loginPrefs", MODE_PRIVATE);
loginPrefsEditor = loginPreferences.edit();
saveLogin = loginPreferences.getBoolean("saveLogin", false);
if (saveLogin == true) {
uid.setText(loginPreferences.getString(username, ""));
pwd.setText(loginPreferences.getString(password, ""));
chkRememberPassword.setChecked(true);
// End
}
}
public void onClick(View view) {
if (view == login) {
// Converts the Text in the User Id and Password field to Strings
username = uid.getText().toString();
password = pwd.getText().toString();
// Loading Dialog Box
final ProgressDialog dialog = new ProgressDialog(
AgentPortalActivity.this);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setMessage("Logging In...");
dialog.show();
Thread t = new Thread(new Runnable() {
public void run() {
while (dialog.getProgress() < dialog.getMax()) {
try {
Thread.sleep(50);
} catch (Exception e) {/* no-op */
}
}
dialog.dismiss();
}
});
t.start();
// End Of Loading Dialog Box
// Hides Soft Keyboard
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(uid.getWindowToken(), 0);
imm.hideSoftInputFromWindow(pwd.getWindowToken(), 0);
// Button OnClick Vibrating Service
Vibrator vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vib.vibrate(50);
// Send username and password strings into screen1 class
Intent i = new Intent(this, screen1.class);
i.putExtra("uid", username);
i.putExtra("pwd", password);
startActivity(i);
// End
if (chkRememberPassword.isChecked()) {
loginPrefsEditor.putBoolean("saveLogin", true);
loginPrefsEditor.putString(username, username);
loginPrefsEditor.putString(password, password);
loginPrefsEditor.commit();
} else {
loginPrefsEditor.clear();
loginPrefsEditor.commit();
}
doSomethingElse();
}
}
public void doSomethingElse() {
overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}