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我寫我的第一個應用程序之一，其中的想法是，用戶輸入一個數字，一個的getText後，當加載，點擊一個按鈕，它增加了用戶輸入以前的結果，並顯示該屏幕。我試着存儲SharedPreferences的數據，並在用戶按下主頁按鈕，然後回來到應用程序，但應用程序崩潰，如果他們按後退按鈕，然後回來到應用程序它的工作原理。有什麼建議？應用程序崩潰，用戶按下後退按鈕
public class Calc extends Activity {
int points = 0;
SharedPreferences data;
public static String filename = "Points";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
data = getSharedPreferences(filename, 0);
points = data.getInt("key", 0);
final TextView myTextView = (TextView) findViewById(R.id.mytextview);
myTextView.setText("" + points);
Button Button = (Button) findViewById(R.id.add);
final EditText Edit = (EditText) findViewById(R.id.input);
Button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int temp = 0;
try {
temp = Integer.parseInt(Edit.getText().toString());
} catch (NumberFormatException nfe) {
System.out.println("Could not parse " + nfe);
}
points = points + temp;
if (points > 9999) {
myTextView.setText("10000+");
} else {
myTextView.setText("" + points);
}
Edit.setText("");
SharedPreferences.Editor editor = data.edit();
editor.putInt("key", points);
editor.commit();
}
});
}
}
崩潰日誌：
05-19 03:24:02.352: D/dalvikvm(1120): GC_EXTERNAL_ALLOC freed 759 objects/55808 bytes in 63ms
05-19 03:24:05.812: D/dalvikvm(1120): GC_EXTERNAL_ALLOC freed 193 objects/9224 bytes in 50ms
05-19 03:24:08.842: W/KeyCharacterMap(1120): No keyboard for id 0
05-19 03:24:08.842: W/KeyCharacterMap(1120): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
05-19 03:24:11.052: W/IInputConnectionWrapper(1120): showStatusIcon on inactive InputConnection
05-19 03:24:14.952: E/dalvikvm-heap(1120): 16704000-byte external allocation too large for this process.
05-19 03:24:14.999: E/GraphicsJNI(1120): VM won't let us allocate 16704000 bytes
05-19 03:24:15.022: D/AndroidRuntime(1120): Shutting down VM
05-19 03:24:15.061: W/dalvikvm(1120): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-19 03:24:15.223: E/AndroidRuntime(1120): FATAL EXCEPTION: main
05-19 03:24:15.223: E/AndroidRuntime(1120): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example/com.example.Calc}: android.view.InflateException: Binary XML file line #2: Error inflating class <unknown>
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.os.Handler.dispatchMessage(Handler.java:99)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.os.Looper.loop(Looper.java:123)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-19 03:24:15.223: E/AndroidRuntime(1120): at java.lang.reflect.Method.invokeNative(Native Method)
05-19 03:24:15.223: E/AndroidRuntime(1120): at java.lang.reflect.Method.invoke(Method.java:521)
05-19 03:24:15.223: E/AndroidRuntime(1120): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-19 03:24:15.223: E/AndroidRuntime(1120): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-19 03:24:15.223: E/AndroidRuntime(1120): at dalvik.system.NativeStart.main(Native Method)
05-19 03:24:15.223: E/AndroidRuntime(1120): Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class <unknown>
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.LayoutInflater.createView(LayoutInflater.java:513)
05-19 03:24:15.223: E/AndroidRuntime(1120): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
05-19 03:24:15.223: E/AndroidRuntime(1120): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.Activity.setContentView(Activity.java:1647)
05-19 03:24:15.223: E/AndroidRuntime(1120): at com.example.Calc.onCreate(Calc.java:32)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-19 03:24:15.223: E/AndroidRuntime(1120): ... 11 more
05-19 03:24:15.223: E/AndroidRuntime(1120): Caused by: java.lang.reflect.InvocationTargetException
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.widget.FrameLayout.<init>(FrameLayout.java:79)
05-19 03:24:15.223: E/AndroidRuntime(1120): at java.lang.reflect.Constructor.constructNative(Native Method)
05-19 03:24:15.223: E/AndroidRuntime(1120): at java.lang.reflect.Constructor.newInstance(Constructor.java:446)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.LayoutInflater.createView(LayoutInflater.java:500)
05-19 03:24:15.223: E/AndroidRuntime(1120): ... 21 more
05-19 03:24:15.223: E/AndroidRuntime(1120): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.Bitmap.nativeCreate(Native Method)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.Bitmap.createBitmap(Bitmap.java:435)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:340)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.BitmapFactory.finishDecode(BitmapFactory.java:488)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:462)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:323)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.content.res.Resources.loadDrawable(Resources.java:1709)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.View.<init>(View.java:1885)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.view.ViewGroup.<init>(ViewGroup.java:291)
05-19 03:24:15.223: E/AndroidRuntime(1120): at android.widget.FrameLayout.<init>(FrameLayout.java:83)
05-19 03:24:15.223: E/AndroidRuntime(1120): ... 25 more
main.xml中
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background" >
<ImageView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="75dp"
android:layout_gravity="center_horizontal|top"
android:paddingLeft="25dip"
android:paddingRight="25dip"
android:src="@drawable/title" />
<EditText
android:id="@+id/input"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|bottom"
android:layout_marginBottom="80dp"
android:ems="10"
android:inputType="number" />
<Button
android:id="@+id/add"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|bottom"
android:layout_marginBottom="20dp"
android:text="Add Points" />
<TextView
android:id="@+id/youHave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|top"
android:layout_marginTop="100dp"
android:background="#AA968454"
android:padding="10dp"
android:text="You have"
android:textColor="#ffffffff" />
<TextView
android:id="@+id/mytextview"
android:layout_width="200dp"
android:layout_height="100dp"
android:layout_gravity="center_horizontal|top"
android:layout_marginTop="150dp"
android:background="#AA968454"
android:gravity="center"
android:textColor="#ffffffff"
android:textSize="60dp" />
</FrameLayout>
包含崩潰日誌... –
添加了崩潰日誌 – AJ9
其中是CalcActivity活動代碼 –