新活动未在 Android 应用中启动

Question

I am trying to start a new activity on button click. I am doing this at various places in my application. 1st when the user is logging into the system. I am using following code for opening new activity:

 btnSignIn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            // Check if Name text control is not empty
            if (etUserName.getText().length() != 0 && etPassword.getText().toString() != "") {
//code to check login is correct or not
                Context ctx = v.getContext();
                Intent intent = new Intent(ctx, DashboardActivity.class);
                ctx.startActivity(intent);

            } else {
               // tv.setText("Please enter name");
            }
        }
    });

This is working fine and DashboardActivity is opened. And on this new screen I have three button, on click of each button a new activity starts.. Code for one of the button is like:

btnMyActivity = (Button) findViewById(R.id.btnMyActivity);
        btnFarmerStatus = (Button) findViewById(R.id.btnFarmerStatus);
        btnMeetings = (Button) findViewById(R.id.btnMeetings);



        btnMyActivity.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Check if Name text control is not empty
                Context ctx =  v.getContext();
                Intent intent = new Intent(v.getContext(), MyactivityActivity.class);
                ctx.startActivity(intent);
            }
        });

Manifest xml is like:

<activity  android:name=".DashboardActivity"  android:screenOrientation="portrait" />
    <activity  android:name=".MyactivityActivity"  android:screenOrientation="portrait" />
    <activity  android:name=".FarmerstatusActivity"  android:screenOrientation="portrait" />

Somehow, the code is same but second-time the new activity is not opening. Infact nothing happens on the screen. What can be wrong in my code?

Update: When DashboardActivity opens logcat shows:

08-05 15:33:04.880 3073-3073/com.it.allied.ots_dashboard I/Choreographer: Skipped 55 frames! The application may be doing too much work on its main thread. 08-05 15:33:05.279 3073-3138/com.it.allied.ots_dashboard E/Surface: getSlotFromBufferLocked: unknown buffer: 0xabda5950

And Here is the code from Myactivityactivity class

public class MyactivityActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_myactivity);
}

@Override
protected void onStart() {
    super.onStart();

    setContentView(R.layout.activity_myactivity);
}

}

Answer 1

btnMyActivity = (Button) findViewById(R.id.btnMyActivity);
    btnFarmerStatus = (Button) findViewById(R.id.btnFarmerStatus);
    btnMeetings = (Button) findViewById(R.id.btnMeetings);

    btnMyActivity.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            // Check if Name text control is not empty
            Intent intent = new Intent(context, MyactivityActivity.class);
            startActivity(intent);
        }
    });

I think this will help you.try this.

Answer 2

It seems that other answers here are not helping you out. Try this :

The other way of creating an Intent is by using the AndroidManifest.xml file.

Steps:

1) Open the AndroidManifest.xml file and move to :

<activity android:name=".MyactivityActivity"> </activity>

2) Now use the intent-filter tag like this :

<activity android:name=".MyactivityActivity">
    <intent-filter>

    </intent-filter>
</activity>

3) Change the action name, eg:

<action android:name="AnythingOfYourChoice" />

(but no space) The ideal way of writing the action name goes like this :

<action android:name="packagename.ActivityName" />

4) Change the category name, eg:

<category android:name="android.intent.category.DEFAULT" />

5) Then use the Implicit Intent

Intent i = new Intent("packagename.ActivityName");
startActivity(i);

This may solve your problem.

Answer 3

First Solution : Define Context context; in your activity and context = this; in onCreate() Method of your activity.

btnMyActivity.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
               Intent intent = new Intent(context, MyactivityActivity.class);
                startActivity(intent);
            }
        });

And

 btnSignIn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            // Check if Name text control is not empty
            if (etUserName.getText().length() != 0 && !(etPassword.getText().toString().equals(""))) {
//code to check login is correct or not
                Intent intent = new Intent(context, DashboardActivity.class);
                startActivity(intent);

            } else {
               // tv.setText("Please enter name");
            }
        }
    });

Second Solution : if you don't want to use context then just replace the context in Intent with yourActivity.this .

Intent intent = new Intent(MyactivityActivity.this, DashboardActivity.class);
startActivity(intent);

Answer 4

i think you check if

 btnSignIn.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {

        if (etUserName.getText().length() != 0 && !(etPassword.getText().toString().equals(""))) {
            Context ctx = v.getContext();
            Intent intent = new Intent(ctx, DashboardActivity.class);
            ctx.startActivity(intent);

        } else {
           // tv.setText("Please enter name");
        }
    }
});

Answer 5

I looks like it is issue with Android 6.0. I am trying to update android emulator and it is not working. I am starting a new thread for android emulator issue.

Answer 6

I had the exact same issue. What I found was that I had written ListView instead of LinearLayout in the xml file. Always check for the layouts you used in the xml, the issue lies there only.