我是初学者，我已经为我的物理研究启动了一个 android 应用程序项目，其中包含所有公式和函数，我有一个恼人的错误，我不知道如何解决他。
错误是，当我运行应用程序时，它会打开我创建的菜单，当我选择此加速选项时，它会使应用程序崩溃。但是所有其他选项都运行顺利。
java类：
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Acceleration extends Activity {
EditText etV0, etV1, etT0, etT1;
TextView tvAccResult;
Button accC;
double CetV0, CetV1, CetT0, CetT1, CtvAccResult;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_acceleration);
initialize();
accC.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tvAccResult.setText(Double.toString(CtvAccResult));
}
});
}
private void initialize() {
etV0 = (EditText) findViewById(R.id.etV0);
etV1 = (EditText) findViewById(R.id.etV1);
etT0 = (EditText) findViewById(R.id.etT0);
etT1 = (EditText) findViewById(R.id.etT1);
tvAccResult = (TextView) findViewById(R.id.tvAccResult);
accC = (Button) findViewById(R.id.accC);
CetV0 = (Double.parseDouble(etV0.getText().toString()));
CetV1 = (Double.parseDouble(etV1.getText().toString()));
CetT0 = (Double.parseDouble(etT0.getText().toString()));
CetT1 = (Double.parseDouble(etT1.getText().toString()));
CtvAccResult = (double) ((CetV0 - CetV1) / (CetT0 - CetT1));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.acceleration, menu);
return true;
}
}
这是布局代码：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Acceleration" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingTop="10dp"
android:text="@string/acceleration"
android:textSize="30dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal"
android:paddingTop="40dp"
android:weightSum="100" >
<EditText
android:id="@+id/etV0"
android:layout_width="15dp"
android:layout_height="wrap_content"
android:layout_weight="16"
android:ems="10"
android:hint="V0" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textSize="30dp" />
<EditText
android:id="@+id/etV1"
android:layout_width="15dp"
android:layout_height="wrap_content"
android:layout_weight="16"
android:ems="10"
android:hint="V1" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="________________________" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal"
android:paddingTop="10dp"
android:paddingBottom="20dp"
android:weightSum="100" >
<EditText
android:id="@+id/etT0"
android:layout_width="15dp"
android:layout_height="wrap_content"
android:layout_weight="16"
android:ems="10"
android:hint="t0" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textSize="30dp" />
<EditText
android:id="@+id/etT1"
android:layout_width="15dp"
android:layout_height="wrap_content"
android:layout_weight="16"
android:ems="10"
android:hint="t1" />
</LinearLayout>
<Button
android:id="@+id/accC"
android:layout_width="wrap_content"
android:layout_height="45dp"
android:layout_gravity="center"
android:text="Calculate"
android:textSize="15dp" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal"
android:paddingTop="30dp"
android:weightSum="100" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="50"
android:paddingLeft="20dp"
android:text="Result: "
android:textSize="20dp" />
<TextView
android:id="@+id/tvAccResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="50"
android:paddingLeft="20dp"
android:text=""
android:textSize="20dp" />
</LinearLayout>
</LinearLayout>
这是logcat：
09-18 17:08:36.546: E/dalvikvm(8215): could not disable core file generation for pid8215: Operation not permitted
09-18 17:08:36.648: E/asset(8215): MAS: getAppPckgAndVerCode package: com.bben.physics === version 1
09-18 17:08:36.664: D/dalvikvm(8215): Trying to load lib lib_glossary.so 0x0
09-18 17:08:36.671: D/dalvikvm(8215): Added shared lib lib_glossary.so 0x0
09-18 17:08:36.671: V/MBGlossaryManager(8215): Current Locale is:he
09-18 17:08:36.679: V/MBGlossaryManager(8215): extended glossary not found, LSA not installed?
09-18 17:08:36.679: E/MBGlossaryManager(8215): Glossary file(s) not found
09-18 17:08:38.601: D/AndroidRuntime(8215): Shutting down VM
09-18 17:08:38.601: W/dalvikvm(8215): threadid=1: thread exiting with uncaught exception (group=0x4001e560)
09-18 17:08:38.617: E/AndroidRuntime(8215): FATAL EXCEPTION: main
09-18 17:08:38.617: E/AndroidRuntime(8215): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bben.physics/com.bben.physics.Acceleration}: java.lang.NumberFormatException:
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1713)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1738)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.ActivityThread.access$1500(ActivityThread.java:124)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:980)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.os.Handler.dispatchMessage(Handler.java:99)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.os.Looper.loop(Looper.java:130)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.ActivityThread.main(ActivityThread.java:3906)
09-18 17:08:38.617: E/AndroidRuntime(8215): at java.lang.reflect.Method.invokeNative(Native Method)
09-18 17:08:38.617: E/AndroidRuntime(8215): at java.lang.reflect.Method.invoke(Method.java:507)
09-18 17:08:38.617: E/AndroidRuntime(8215): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:840)
09-18 17:08:38.617: E/AndroidRuntime(8215): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:598)
09-18 17:08:38.617: E/AndroidRuntime(8215): at dalvik.system.NativeStart.main(Native Method)
09-18 17:08:38.617: E/AndroidRuntime(8215): Caused by: java.lang.NumberFormatException:
09-18 17:08:38.617: E/AndroidRuntime(8215): at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:267)
09-18 17:08:38.617: E/AndroidRuntime(8215): at java.lang.Double.parseDouble(Double.java:318)
09-18 17:08:38.617: E/AndroidRuntime(8215): at com.bben.physics.Acceleration.initialize(Acceleration.java:43)
09-18 17:08:38.617: E/AndroidRuntime(8215): at com.bben.physics.Acceleration.onCreate(Acceleration.java:23)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-18 17:08:38.617: E/AndroidRuntime(8215): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1677)
09-18 17:08:38.617: E/AndroidRuntime(8215): ... 11 more
09-18 17:08:42.281: I/Process(8215): Sending signal. PID: 8215 SIG: 9
09-18 17:08:53.015: W/KeyCharacterMap(8345): Can't open keycharmap file
09-18 17:08:53.015: W/KeyCharacterMap(8345): Error loading keycharmap file '/data/usr/keychars/cy8c201xx.kcm.bin'. hw.keyboards.65539.devname='cy8c201xx'
09-18 17:08:53.015: W/KeyCharacterMap(8345): Can't open keycharmap file
09-18 17:08:53.015: W/KeyCharacterMap(8345): Error loading keycharmap file '/system/usr/keychars/cy8c201xx.kcm.bin'. hw.keyboards.65539.devname='cy8c201xx'
09-18 17:08:53.015: W/KeyCharacterMap(8345): Can't open keycharmap file
09-18 17:08:53.015: W/KeyCharacterMap(8345): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
09-18 17:09:03.625: D/AndroidRuntime(8345): Shutting down VM
09-18 17:09:03.625: W/dalvikvm(8345): threadid=1: thread exiting with uncaught exception (group=0x4001e560)
09-18 17:09:03.625: E/AndroidRuntime(8345): FATAL EXCEPTION: main
09-18 17:09:03.625: E/AndroidRuntime(8345): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bben.physics/com.bben.physics.Acceleration}: java.lang.NumberFormatException:
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1713)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1738)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.ActivityThread.access$1500(ActivityThread.java:124)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:980)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.os.Handler.dispatchMessage(Handler.java:99)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.os.Looper.loop(Looper.java:130)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.ActivityThread.main(ActivityThread.java:3906)
09-18 17:09:03.625: E/AndroidRuntime(8345): at java.lang.reflect.Method.invokeNative(Native Method)
09-18 17:09:03.625: E/AndroidRuntime(8345): at java.lang.reflect.Method.invoke(Method.java:507)
09-18 17:09:03.625: E/AndroidRuntime(8345): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:840)
09-18 17:09:03.625: E/AndroidRuntime(8345): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:598)
09-18 17:09:03.625: E/AndroidRuntime(8345): at dalvik.system.NativeStart.main(Native Method)
09-18 17:09:03.625: E/AndroidRuntime(8345): Caused by: java.lang.NumberFormatException:
09-18 17:09:03.625: E/AndroidRuntime(8345): at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:267)
09-18 17:09:03.625: E/AndroidRuntime(8345): at java.lang.Double.parseDouble(Double.java:318)
09-18 17:09:03.625: E/AndroidRuntime(8345): at com.bben.physics.Acceleration.initialize(Acceleration.java:43)
09-18 17:09:03.625: E/AndroidRuntime(8345): at com.bben.physics.Acceleration.onCreate(Acceleration.java:23)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
09-18 17:09:03.625: E/AndroidRuntime(8345): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1677)
09-18 17:09:03.625: E/AndroidRuntime(8345): ... 11 more
09-18 17:09:06.781: I/Process(8345): Sending signal. PID: 8345 SIG: 9