I'm trying to open open the wifi setting programmatically in an andoird app. It works on most devices, but on an android tablet it crashes and gives me this error:
android.content.ActivityNotFoundException: Unable to find explicit activity class {com.android.settings/com.android.settings.wifi.WifiSettings}; have you declared this activity in your AndroidManifest.xml?
Here is my code in the main activity:
Button wifisettings = (Button) findViewById(R.id.WiFiSettings);
wifisettings.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
final Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
final ComponentName cn = new ComponentName("com.android.settings", "com.android.settings.wifi.WifiSettings");
intent.setComponent(cn);
intent.setFlags(intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
If you want to call WiFiSettings from your app use this:
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
Look into this https://developer.android.com/reference/android/provider/Settings for further sttings and how to take the user there
Try adding this in your AndroidManifest.xml:
<activity
android:name="com.android.settings.wifi.WifiSettings"/>
Same issue reported by other users in comments.
Update: If it didn't work, use this line which is simpler to use:
Button wifisettings = (Button) findViewById(R.id.WiFiSettings);
wifisettings.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
}
});
Related
I am getting this warning on resolveActivity line while using implicit intents and I am unable to open any website because of that.
btnWeb.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String v = et.getText().toString();
Uri uri = Uri.parse(v);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
if (intent.resolveActivity(getPackageManager())!=null){
startActivity(intent);
}
}
});
Get rid of resolveActivity(). Just call startActivity(), but do so in a try/catch, so you can catch the ActivityNotFoundException if there is no Web browser available.
This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 7 years ago.
I ran this app on my phone just fine and then, after changing nothing, I changed out to install on my nexus 7. Now I am receiving this error.
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.th3ramr0d.tc3studyguide.MainActivity.onCreate(MainActivity.java:37)
This is the code at line 37.
rateMe.setOnClickListener(new View.OnClickListener() {
This is the entire block of code for the setOnClickListener
Button rateMe = (Button)findViewById(R.id.rateMe);
rateMe.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.th3ramr0d.app"));
startActivity(intent);
}
});
XML File
<Button
android:id="#+id/rateMe"
android:text="Rate Me"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
This worked just fine on my phone. I then tried to install it on my phone and it gives me the exact same error now. I have tried:
Gradle Sync
Rebuild app
Clean app
Uninstalled app on phone and tablet
Restarted both devices
Restarted Android Studio
Restarted computer
OnCreate Method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
boolean firstTimeRun = getFirstTimeRun();
if (firstTimeRun == true) {
firstTimeRun();
} else {
run();
}
Button rateMe = (Button)findViewById(R.id.rateMe);
ImageView prt = (ImageView)findViewById(R.id.prt);
ImageView pfp = (ImageView)findViewById(R.id.pfp);
rateMe.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.th3ramr0d.tc3studyguide"));
startActivity(intent);
}
});
prt.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.th3ramr0d.prtmanagerfree"));
startActivity(intent);
}
});
pfp.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=com.th3ramr0d.poundforpoundfree"));
startActivity(intent);
}
});
}
You didn't set your content view:
setContentView(R.layout.your_xml);
I am trying to make an on click button which makes phone calls when pressed.
Here is my code for java:
public void CampusSafClick(View view){
Intent callIntent =new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:6038994210"));
startActivity(callIntent);
}
I understand how to make onclick buttons, so that is not the issue.
I have this code in the manifest:
<uses-permission android:name="android.permision.CALL_PHONE"></uses-permission>
I keep getting the error Unfortunately your app has stop working.
Here is the working code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
dialContactPhone("123123123");
}
});
}
private void dialContactPhone(final String phoneNumber) {
startActivity(new Intent(Intent.ACTION_DIAL, Uri.fromParts("tel", phoneNumber, null)));
}
You need Action_Dial,
use below code it will open Dealer with number specified.
Intent intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:0123456789"));
startActivity(intent);
The tel: prefix is required, otherwhise the following exception will be thrown: java.lang.IllegalStateException: Could not execute method of the activity.
Action_Dial doesn't require any permission.
If you want to initiate the call directly without user's interaction, you can use action Intent.ACTION_CALL. In this case, you must add the following permission in your AndroidManifest.xml:
<uses-permission android:name="android.permission.CALL_PHONE" />
I need to enter code above the application list on the manifest:
<uses-permission android:name="android.permission.CALL_PHONE"/>
You can use the following code
intent =new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:+251999999999"));
startActivity(intent);
and include in manifest file
<uses-permission android:name="android.permission.CALL_PHONE"/>
ivCall.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (serviceListDates.get(position).getUser_mobile().length() != 0) {
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setTitle("NKA SERVICE");
alertDialog.setMessage("Do you want to Call ?");
alertDialog.setIcon(R.drawable.call_icon);
alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
((DeliveredServiceOilActivity) mContext).callPhoneNumber
(serviceListDates.get(position).getUser_mobile());
}
});`enter code here
alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
} else
AlertUtils.SHOW_TOAST(mContext, mContext.getString(R.string.please_add_number));
}
});
For make a call using android, It can be implement using Intents.
public void MakePhoneCall(View view){
Intent callIntent =new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:9961907453"));
if (ActivityCompat.checkSelfPermission(MainActivity.this,
Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
return;
}
startActivity(callIntent);
}
I have this code in the manifest:
<uses-permission android:name="android.permision.CALL_PHONE"></uses-permission>
If you are using SDK version greater than Lolipop then you should include request permission.
Im new on Java so its confusing me a little bit, i want to create an intent for Activity two but there seem to be a problem with the code that i have written.
#Override
public void onClick(View v) {
// TODO:
// Launch Activity Two
// Hint: use Context's startActivity() method
// Create an intent stating which Activity you would like to
// start
Intent activityTwo = new Intent(ActivityTwo.this.finish());
Intent intent = null;
// Launch the Activity using the intent
startActivity(activityTwo);
}
});
// Has previous state been saved?
if (savedInstanceState != null) {
// TODO:
// Restore value of counters from saved state
super.onRestoreInstanceState(savedInstanceState);
mCreate = savedInstanceState.getInt(CREATE_KEY);
mRestart = savedInstanceState.getInt(RESTART_KEY);
mStart = savedInstanceState.getInt(START_KEY);
}
// Emit LogCat message
Log.i(TAG, "Entered the onCreate() method");
// TODO:
from First to Second:
Button next = (Button) findViewById(R.id.button2);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(),Second.class);
intent.putExtra("Tag", "Value");
startActivity(intent);
finish();
}});
Second to First:
Button previous= (Button) findViewById(R.id.button);
previous.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(),First.class);
startActivity(intent);
}});
First Understand the concept of Intent.
In your case, you want to call ActivityTwo from ActivityOne.
follow this steps
Create ActivityTwo.
Declare ActivityTwo in your AndroidManifest.xml
<activity android:name=".ActivityTwo" />
Write Intent code where in onclick() method.
Intent intent = new Intent(getApplicationContext(),ActivityTwo.class);
startActivity(intent);
In this code Intent Constructor contains two parameters.
Current Context
ActivityTwo reference.
Ok so I am very new to the Android programming, I am starting week 2 of this class and cannot for the life of me figure out what is going wrong. I have read/watched tons of tutorials on adding new Activities and nothing works.
Assignment: Use the Activities app and add a fourth activity
My activity is simple, 3 buttons and an image. One button makes the image visible and the other makes it invisible. Third returns back to the main.
Note: I edited the original app to have buttons on Main Activity because it had me hitting center on the d-pad which I found dumb. Another note is that Activity 2 & 3 use the same layout and do basically the same thing from what I can tell
public class MainActivity extends Activity {
String tag = "Events";
int request_Code = 1;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//---hides the title bar---
//requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
Log.d(tag, "In the onCreate() event");
Button act2Butt = (Button) findViewById(R.id.act2Butt);
Button act3Butt = (Button) findViewById(R.id.act3Butt);
Button act4Butt = (Button) findViewById(R.id.act4Butt);
act2Butt.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startActivityForResult(new Intent("net.learn2develop.ACTIVITY2"), request_Code);
}
});
act3Butt.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startActivityForResult(new Intent("net.learn2develop.ACTIVITY2"), request_Code);
}
});
act4Butt.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startActivityForResult(new Intent("net.learn2develop.MYACTIVITY"), request_Code);
}
});
}
/*
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
{
//startActivity(new Intent("net.learn2develop.ACTIVITY2"));
//startActivity(new Intent(this, Activity2.class));
startActivityForResult(new Intent(
"net.learn2develop.ACTIVITY2"),
request_Code);
}
return false;
}
*/
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == request_Code) {
if (resultCode == RESULT_OK) {
Toast.makeText(this,data.getData().toString(),
Toast.LENGTH_LONG).show();
}
}
}
public void onStart()
{
super.onStart();
Log.d(tag, "In the onStart() event");
}
public void onRestart()
{
super.onRestart();
Log.d(tag, "In the onRestart() event");
}
public void onResume()
{
super.onResume();
Log.d(tag, "In the onResume() event");
}
public void onPause()
{
super.onPause();
Log.d(tag, "In the onPause() event");
}
public void onStop()
{
super.onStop();
Log.d(tag, "In the onStop() event");
}
public void onDestroy()
{
super.onDestroy();
Log.d(tag, "In the onDestroy() event");
}
public class MyActivity extends Activity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity4);
Button yesButt = (Button) findViewById(R.id.yesButton);
Button noButt = (Button) findViewById(R.id.noButton);
Button finButt = (Button) findViewById(R.id.finButton);
final ImageView img1 = (ImageView) findViewById(R.id.image1);
yesButt.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
img1.setVisibility(View.VISIBLE);
}
});
noButt.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
img1.setVisibility(View.INVISIBLE);
}
});
finButt.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent data = new Intent();
data.setData(Uri.parse("OMG IT WORKS"));
setResult(RESULT_OK, data);
finish();
}
});
}
public class Activity2 extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2);
String defaultName="";
Bundle extras = getIntent().getExtras();
if (extras!=null)
{
defaultName = extras.getString("Name");
}
//---get the EditText view---
EditText txt_username =
(EditText) findViewById(R.id.txt_username);
txt_username.setHint(defaultName);
//---get the OK button---
Button btn = (Button) findViewById(R.id.btn_OK);
//---event handler for the OK button---
btn.setOnClickListener(new View.OnClickListener()
{
public void onClick(View view) {
Intent data = new Intent();
//---get the EditText view---
EditText txt_username =
(EditText) findViewById(R.id.txt_username);
//---set the data to pass back---
data.setData(Uri.parse(
txt_username.getText().toString()));
setResult(RESULT_OK, data);
//---closes the activity---
finish();
}
});
}
I have entered the code for Main Activity, My Activity (the one I made), and Activity 2. My Activity runs great and does exactly what I want it to but if I try to access it from main it dies.
928-928/net.learn2develop.Activities E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: net.learn2develop.Activities, PID: 928
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=net.learn2develop.MYACTIVITY }
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1765)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1485)
at android.app.Activity.startActivityForResult(Activity.java:3736)
at android.app.Activity.startActivityForResult(Activity.java:3697)
at net.learn2develop.Activities.MainActivity$3.onClick(MainActivity.java:48)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
This code is for my last attempt and making it work before throwing my hands up. Last thing I did was make My Activity act like the other and use startActivityForResult.
Any help would help greatly. I don't know if it matters or not but I do not have a .class for My Activity in the bin directory but there is one for all the others.
If you need any more info please just ask.
Like I said before I'm really new to the whole Android area.
Edit: Manifest
<activity android:name=".MyActivity"
android:label="My Activity">
<intent-filter>
<action android:name="net.learn2develop.MYACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
You may need to add the Activity to the manifest. If you are sure you have done this, I would recommend using an Intent slightly differently.
Try using an Intent the following way:
Intent intent = new Intent(MyActivity.this, SecondActivity.class);
startActivityForResult(intent, requestCode);
The first parameter of this Intent is the current Activity. The second parameter is theActivity you wish to navigate to. Handling an Intent this way prevents a small typo in the package name which would throw that exception. As long as the Activity you are trying to navigate to is in the manifest and you have set up your Intent like the code above, everything should work fine.
Good luck and happy coding!
you need to add your activity to your manifest
<activity
android:name=".MySecondActivity"
android:label="#string/title_second_activity">
</activity>
net.learn2develop.MYACTIVITY
Android is not finiding the above activity like other engineers said,add this activity in your manifest file so JVM can find which class you are referring to.