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POandroid calculator: memory function
 

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  1. POandroid calculator: memory function
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    <p>I am currently designing an android calculator app and is currently working on the memory part. I would like to show the wording "memory saved" if the memory is non-zero. </p> <p>The memory calculation part is ok runnable, however, once I add the wording part as follows, it crashes. It cannot be started up totally. Why?</p> <pre><code>EditText Memorydisplay; ArrayList&lt;Double&gt; tempfigure = new ArrayList&lt;Double&gt;(); double tempfigure1; double memory1 = 0; </code></pre> <p>... </p> <pre><code>Memorydisplay = (EditText) findViewById(R.id.memoryEditText); mplus = (TextView) findViewById(R.id.Mplus); mminus = (TextView) findViewById(R.id.Mdeduct); mclear = (TextView) findViewById(R.id.MC); mrecall = (TextView) findViewById(R.id.MR); mplus.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { tempfigure.add(Double.parseDouble(Display.getText().toString())); memory1=memory1+tempfigure.get(0); tempfigure1=0; tempfigure.removeAll(tempfigure); Display.setText("0"); if (memory1 &gt;0) { Memorydisplay.setText("Memory saved");} } }); mminus.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { tempfigure.add(Double.parseDouble(Display.getText().toString())); memory1=memory1-tempfigure.get(0); tempfigure1=0; tempfigure.removeAll(tempfigure); Display.setText("0"); if (memory1 &gt;0) { Memorydisplay.setText("Memory saved");} } }); mclear.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { memory1=0; tempfigure1=0; tempfigure.removeAll(tempfigure); Display.setText("0"); if (memory1 &gt;0) { Memorydisplay.setText("Memory saved");} } }); mrecall.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Display.setText(""+memory1); if (memory1 &gt;0) { Memorydisplay.setText("Memory saved");} } }); </code></pre> <p><strong>Logcat extracted:</strong></p> <pre><code>08-23 21:37:31.364: W/dalvikvm(2207): threadid=1: thread exiting with uncaught exception (group=0x409961f8) 08-23 21:37:31.374: E/AndroidRuntime(2207): FATAL EXCEPTION: main 08-23 21:37:31.374: E/AndroidRuntime(2207): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pearmak.jm7_calculator/com.pearmak.jm7_calculator.MainActivity}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.ActivityThread.access$600(ActivityThread.java:122) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.os.Handler.dispatchMessage(Handler.java:99) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.os.Looper.loop(Looper.java:137) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.ActivityThread.main(ActivityThread.java:4340) 08-23 21:37:31.374: E/AndroidRuntime(2207): at java.lang.reflect.Method.invokeNative(Native Method) 08-23 21:37:31.374: E/AndroidRuntime(2207): at java.lang.reflect.Method.invoke(Method.java:511) 08-23 21:37:31.374: E/AndroidRuntime(2207): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 08-23 21:37:31.374: E/AndroidRuntime(2207): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 08-23 21:37:31.374: E/AndroidRuntime(2207): at dalvik.system.NativeStart.main(Native Method) 08-23 21:37:31.374: E/AndroidRuntime(2207): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText 08-23 21:37:31.374: E/AndroidRuntime(2207): at com.pearmak.jm7_calculator.MainActivity.onCreate(MainActivity.java:88) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.Activity.performCreate(Activity.java:4465) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 08-23 21:37:31.374: E/AndroidRuntime(2207): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 08-23 21:37:31.374: E/AndroidRuntime(2207): ... 11 more 08-23 21:37:39.748: I/Process(2207): Sending signal. PID: 2207 SIG: 9 </code></pre>
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    1. USpearmak
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    1. COPlease add a stacktrace or something a little more descriptive that "it crashes"
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    2. COthx for your prompt reply.. the app cannot start up totally
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      1. USpearmak
    3. COEven if it does not start you should see an exception with a stacktrace in logcat ;-)
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      1. POandroid calculator: memory function
      1. USmicha
 

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