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POAllow a button clickable when other button on other tab is clicked
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copied!<p>In my android app, I have two tabs. First tab contain a button called "Save" which I already set it as <code>btn.setEnable(false)</code>.</p> <p>On the second tab I have a "Clear" button.</p> <p>So what I intend to do is when I click "Clear" button, I want the "Save" button to be clickable.</p> <p>Below Code is to show when "Clear" button is clicked.</p> <pre><code> public void Clear(View view) { StringBuilder text = new StringBuilder(); try { InputStream instream = openFileInput("myfile.txt"); if (instream != null) { InputStreamReader inputreader = new InputStreamReader(instream); BufferedReader buffreader = new BufferedReader(inputreader); File dir = getFilesDir(); File file = new File(dir, "myfile.txt"); boolean delete = file.delete(); } } catch (IOException e) { e.printStackTrace(); } Button btn=(Button)findViewById(R.id.Save); btn.setEnabled(true); TextView myTextView = (TextView) findViewById(R.id.TextView1); myTextView.setText(""); } } </code></pre> <p>Just ignore my TODO code... I am confuse about where should I put my</p> <pre><code>Button btn=(Button)findViewById(R.id.Save); btn.setEnabled(true); </code></pre> <p>The result of this code lead to app force close, logcat shows nothing. Any helps will be appreciated. Thanks</p> <p><strong>ATTEMPT:</strong> According to Vikram, after I click "Clear" button the app force to close LogCat :</p> <pre><code>07-25 13:15:02.430: W/System.err(4739): java.io.FileNotFoundException: /data/data/com.example.androidtablayout/files/myfile.txt: open failed: ENOENT (No such file or directory) 07-25 13:15:02.445: W/System.err(4739): at libcore.io.IoBridge.open(IoBridge.java:406) 07-25 13:15:02.445: W/System.err(4739): at java.io.FileInputStream.<init>(FileInputStream.java:78) 07-25 13:15:02.445: W/System.err(4739): at android.app.ContextImpl.openFileInput(ContextImpl.java:673) 07-25 13:15:02.445: W/System.err(4739): at android.content.ContextWrapper.openFileInput(ContextWrapper.java:159) 07-25 13:15:02.445: W/System.err(4739): at com.example.androidtablayout.HistoryActivity.ViewText(HistoryActivity.java:114) 07-25 13:15:02.445: W/System.err(4739): at java.lang.reflect.Method.invokeNative(Native Method) 07-25 13:15:02.445: W/System.err(4739): at java.lang.reflect.Method.invoke(Method.java:511) 07-25 13:15:02.445: W/System.err(4739): at android.view.View$1.onClick(View.java:3064) 07-25 13:15:02.445: W/System.err(4739): at android.view.View.performClick(View.java:3591) 07-25 13:15:02.445: W/System.err(4739): at android.view.View$PerformClick.run(View.java:14263) 07-25 13:15:02.445: W/System.err(4739): at android.os.Handler.handleCallback(Handler.java:605) 07-25 13:15:02.445: W/System.err(4739): at android.os.Handler.dispatchMessage(Handler.java:92) 07-25 13:15:02.445: W/System.err(4739): at android.os.Looper.loop(Looper.java:137) 07-25 13:15:02.445: W/System.err(4739): at android.app.ActivityThread.main(ActivityThread.java:4507) 07-25 13:15:02.450: W/System.err(4739): at java.lang.reflect.Method.invokeNative(Native Method) 07-25 13:15:02.450: W/System.err(4739): at java.lang.reflect.Method.invoke(Method.java:511) 07-25 13:15:02.455: W/System.err(4739): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 07-25 13:15:02.455: W/System.err(4739): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 07-25 13:15:02.455: W/System.err(4739): at dalvik.system.NativeStart.main(Native Method) 07-25 13:15:02.455: W/System.err(4739): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory) 07-25 13:15:02.460: D/dalvikvm(4739): GC_CONCURRENT freed 112K, 3% free 9418K/9671K, paused 2ms+2ms 07-25 13:15:02.460: W/System.err(4739): at libcore.io.Posix.open(Native Method) 07-25 13:15:02.460: W/System.err(4739): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110) 07-25 13:15:02.460: W/System.err(4739): at libcore.io.IoBridge.open(IoBridge.java:390) 07-25 13:15:02.460: W/System.err(4739): ... 18 more 07-25 13:15:03.730: D/Network(4739): Network 07-25 13:15:03.940: D/Network(4739): Network 07-25 13:15:04.140: D/Network(4739): Network 07-25 13:15:04.335: D/Network(4739): Network 07-25 13:15:08.215: D/AndroidRuntime(4739): Shutting down VM 07-25 13:15:08.215: W/dalvikvm(4739): threadid=1: thread exiting with uncaught exception (group=0x40c3e1f8) 07-25 13:15:08.220: E/AndroidRuntime(4739): FATAL EXCEPTION: main 07-25 13:15:08.220: E/AndroidRuntime(4739): java.lang.IllegalStateException: Could not execute method of the activity 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.view.View$1.onClick(View.java:3069) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.view.View.performClick(View.java:3591) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.view.View$PerformClick.run(View.java:14263) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.os.Handler.handleCallback(Handler.java:605) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.os.Handler.dispatchMessage(Handler.java:92) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.os.Looper.loop(Looper.java:137) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.app.ActivityThread.main(ActivityThread.java:4507) 07-25 13:15:08.220: E/AndroidRuntime(4739): at java.lang.reflect.Method.invokeNative(Native Method) 07-25 13:15:08.220: E/AndroidRuntime(4739): at java.lang.reflect.Method.invoke(Method.java:511) 07-25 13:15:08.220: E/AndroidRuntime(4739): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 07-25 13:15:08.220: E/AndroidRuntime(4739): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 07-25 13:15:08.220: E/AndroidRuntime(4739): at dalvik.system.NativeStart.main(Native Method) 07-25 13:15:08.220: E/AndroidRuntime(4739): Caused by: java.lang.reflect.InvocationTargetException 07-25 13:15:08.220: E/AndroidRuntime(4739): at java.lang.reflect.Method.invokeNative(Native Method) 07-25 13:15:08.220: E/AndroidRuntime(4739): at java.lang.reflect.Method.invoke(Method.java:511) 07-25 13:15:08.220: E/AndroidRuntime(4739): at android.view.View$1.onClick(View.java:3064) 07-25 13:15:08.220: E/AndroidRuntime(4739): ... 11 more 07-25 13:15:08.220: E/AndroidRuntime(4739): Caused by: java.lang.NullPointerException 07-25 13:15:08.220: E/AndroidRuntime(4739): at com.example.androidtablayout.HistoryActivity.Clear(HistoryActivity.java:172) 07-25 13:15:08.220: E/AndroidRuntime(4739): ... 14 more </code></pre> <p>Acoording to Tarsem, app force to close :</p> <p>**</p> <pre><code>07-25 13:25:56.960: D/Network(6667): Network 07-25 13:25:57.000: D/dalvikvm(6667): GC_CONCURRENT freed 112K, 3% free 9417K/9671K, paused 2ms+3ms 07-25 13:25:57.155: D/Network(6667): Network 07-25 13:25:57.315: D/Network(6667): Network 07-25 13:25:57.440: D/Network(6667): Network 07-25 13:25:59.010: D/AndroidRuntime(6667): Shutting down VM 07-25 13:25:59.010: W/dalvikvm(6667): threadid=1: thread exiting with uncaught exception (group=0x40c3e1f8) 07-25 13:25:59.020: E/AndroidRuntime(6667): FATAL EXCEPTION: main 07-25 13:25:59.020: E/AndroidRuntime(6667): java.lang.IllegalStateException: Could not execute method of the activity 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.view.View$1.onClick(View.java:3069) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.view.View.performClick(View.java:3591) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.view.View$PerformClick.run(View.java:14263) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.os.Handler.handleCallback(Handler.java:605) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.os.Handler.dispatchMessage(Handler.java:92) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.os.Looper.loop(Looper.java:137) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.app.ActivityThread.main(ActivityThread.java:4507) 07-25 13:25:59.020: E/AndroidRuntime(6667): at java.lang.reflect.Method.invokeNative(Native Method) 07-25 13:25:59.020: E/AndroidRuntime(6667): at java.lang.reflect.Method.invoke(Method.java:511) 07-25 13:25:59.020: E/AndroidRuntime(6667): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 07-25 13:25:59.020: E/AndroidRuntime(6667): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 07-25 13:25:59.020: E/AndroidRuntime(6667): at dalvik.system.NativeStart.main(Native Method) 07-25 13:25:59.020: E/AndroidRuntime(6667): Caused by: java.lang.reflect.InvocationTargetException 07-25 13:25:59.020: E/AndroidRuntime(6667): at java.lang.reflect.Method.invokeNative(Native Method) 07-25 13:25:59.020: E/AndroidRuntime(6667): at java.lang.reflect.Method.invoke(Method.java:511) 07-25 13:25:59.020: E/AndroidRuntime(6667): at android.view.View$1.onClick(View.java:3064) 07-25 13:25:59.020: E/AndroidRuntime(6667): ... 11 more 07-25 13:25:59.020: E/AndroidRuntime(6667): Caused by: java.lang.NullPointerException 07-25 13:25:59.020: E/AndroidRuntime(6667): at com.example.androidtablayout.HistoryActivity.Clear(HistoryActivity.java:171) 07-25 13:25:59.020: E/AndroidRuntime(6667): ... 14 more </code></pre> <p>**</p>

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