Android create multiple textviews dynamically

Question

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Hello,

I want to create multiple TextViews in a LinearLayout Programmatically, and for this tried the below code but it gives me the error below.

Please help me to resolve the issue.

XML

2023-03-23 11:50:19.704 9003-9003/com.nyt.kitaab.quranshareef E/MiuiMultiWindowUtils: initFreeFormResolutionArgs failed, device is citrus
2023-03-23 11:50:20.381 9003-9050/com.nyt.kitaab.quranshareef E/ab.quransharee: open libmigui.so failed! dlopen - dlopen failed: library "libmigui.so" not found
2023-03-23 11:50:23.157 9003-9003/com.nyt.kitaab.quranshareef E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.nyt.kitaab.quranshareef, PID: 9003
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nyt.kitaab.quranshareef/com.nyt.kitaab.quranshareef.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setLayoutParams(android.view.ViewGroup$LayoutParams)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3774)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3941)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:211)
        at android.os.Looper.loop(Looper.java:300)
        at android.app.ActivityThread.main(ActivityThread.java:8322)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setLayoutParams(android.view.ViewGroup$LayoutParams)' on a null object reference
        at com.nyt.kitaab.quranshareef.MainActivity.onCreate(MainActivity.java:27)
        at android.app.Activity.performCreate(Activity.java:8198)
        at android.app.Activity.performCreate(Activity.java:8165)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1342)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3754)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3941) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loopOnce(Looper.java:211) 
        at android.os.Looper.loop(Looper.java:300) 
        at android.app.ActivityThread.main(ActivityThread.java:8322) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038) 
2023-03-23 11:51:18.893 9571-9571/com.nyt.kitaab.quranshareef E/MiuiMultiWindowUtils: initFreeFormResolutionArgs failed, device is citrus
2023-03-23 11:51:19.446 9571-9605/com.nyt.kitaab.quranshareef E/ab.quransharee: open libmigui.so failed! dlopen - dlopen failed: library "libmigui.so" not found
2023-03-23 11:51:22.320 9571-9571/com.nyt.kitaab.quranshareef E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.nyt.kitaab.quranshareef, PID: 9571
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nyt.kitaab.quranshareef/com.nyt.kitaab.quranshareef.MainActivity}: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3774)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3941)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:211)
        at android.os.Looper.loop(Looper.java:300)
        at android.app.ActivityThread.main(ActivityThread.java:8322)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038)
     Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
        at com.nyt.kitaab.quranshareef.MainActivity.onCreate(MainActivity.java:27)
        at android.app.Activity.performCreate(Activity.java:8198)
        at android.app.Activity.performCreate(Activity.java:8165)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1342)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3754)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3941) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loopOnce(Looper.java:211) 
        at android.os.Looper.loop(Looper.java:300) 
        at android.app.ActivityThread.main(ActivityThread.java:8322) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038)

What I have tried:

Java

setContentView(R.layout.activity_main);
        LinearLayout linearLayout = findViewById(R.id.llayout);
        // Add TextView to LinearLayout
        if (linearLayout != null) {
            TextView[] textView = new TextView[0];
            for(int i=0;i<=113;i++) {
        // Create TextView programmatically.
        textView[i].setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        textView[i].setTextColor(Color.WHITE);
        textView[i].setGravity(Gravity.CENTER);

        textView[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Clicked on me", Toast.LENGTH_LONG).show();
            }
        });
                textView[i].setText("Click on me");
                linearLayout.addView(textView[i]);
            }
        }

Posted 22-Mar-23 20:53pm

nyt1972

Updated 23-Mar-23 8:46am

Add a Solution

2 solutions

Solution 2

Changed but still getting errors:

Java

setContentView(R.layout.activity_main);
        LinearLayout linearLayout = findViewById(R.id.llayout);
        // Add TextView to LinearLayout
        if (linearLayout != null) {
            TextView[] textView = new TextView[14];
            for(int i=0;i<=113;i++) {
        // Create TextView programmatically.
        textView[i].setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        textView[i].setTextColor(Color.WHITE);
        textView[i].setGravity(Gravity.CENTER);

        textView[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Clicked on me", Toast.LENGTH_LONG).show();
            }
        });
                textView[i].setText("Click on me");
                linearLayout.addView(textView[i]);
            }
        }

XML

2023-03-23 23:41:50.336 23450-23450/com.nyt.kitaab.quranshareef E/MiuiMultiWindowUtils: initFreeFormResolutionArgs failed, device is citrus
2023-03-23 23:41:50.883 23450-23482/com.nyt.kitaab.quranshareef E/ab.quransharee: open libmigui.so failed! dlopen - dlopen failed: library "libmigui.so" not found
2023-03-23 23:41:53.710 23450-23450/com.nyt.kitaab.quranshareef E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.nyt.kitaab.quranshareef, PID: 23450
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nyt.kitaab.quranshareef/com.nyt.kitaab.quranshareef.QuranActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setLayoutParams(android.view.ViewGroup$LayoutParams)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3774)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3941)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loopOnce(Looper.java:211)
        at android.os.Looper.loop(Looper.java:300)
        at android.app.ActivityThread.main(ActivityThread.java:8322)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setLayoutParams(android.view.ViewGroup$LayoutParams)' on a null object reference
        at com.nyt.kitaab.quranshareef.QuranActivity.onCreate(QuranActivity.java:27)
        at android.app.Activity.performCreate(Activity.java:8198)
        at android.app.Activity.performCreate(Activity.java:8165)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1342)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3754)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3941) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loopOnce(Looper.java:211) 
        at android.os.Looper.loop(Looper.java:300) 
        at android.app.ActivityThread.main(ActivityThread.java:8322) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038)

Posted 23-Mar-23 8:46am

nyt1972

Comments

David Crow 24-Mar-23 8:06am

TextView[] textView = new TextView[14];
for(int i=0;i<=113;i++) {

Look at these statements very closely.

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Accepted Answer · 2023-03-22T23:57:00

You create an array reference of TextViews with no entries:

Java

TextView[] textView = new TextView[0];

and you then try to refer to 114 of them, even though they do not exist.

Java

    for(int i=0;i<=113;i++) {
// Create TextView programmatically.
textView[i].setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,

You need to create the 114 TextViews in the array before you can refer to them.

Java

TextView[] textView = new TextView[114];

Android create multiple textviews dynamically

2 solutions

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Android create multiple textviews dynamically

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