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我有以下代码是专门为用户点击一个按钮,当他们点击按钮时,他们正在查看的特定字符串被收藏并存储在其他地方。如何正确使用load数组和保存数组方法?
我有两个问题。
一个什么是我现在有什么问题吗?因为它点击按钮时会崩溃。
你将如何完成加载数组方法来加载并保存到数组中的字符串,以便用户以后可以看到该数组?
感谢您的时间!
fav.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
loadArray("favorites");
favorites = Arrays.copyOf(favorites, favorites.length+1);
favorites[favorites.length]=display.getText().toString();
saveArray(favorites, "favorites");
}
});
home.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent openStartingPoint = new Intent("starting.rt.Menu2");
startActivity(openStartingPoint);
}
});
search.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent openStartingPoint = new Intent("starting.rt.Search");
startActivity(openStartingPoint);
}
});
moreapps.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent goToMarket;
goToMarket = new Intent(Intent.ACTION_VIEW, Uri
.parse("market://search?q=pub:\"Wompa\""));
startActivity(goToMarket);
}
});
}
public String[] loadArray(String arrayName) {
SharedPreferences prefs = getSharedPreferences("preferencename", 0);
int size = prefs.getInt(arrayName + "_size", 0);
String array[] = new String[size];
for(int i=0;i<size;i++)
array[i] = prefs.getString(arrayName + "_" + i, null);
return array;
}
public boolean saveArray(String[] array, String arrayName) {
SharedPreferences prefs = getSharedPreferences("preferencename", 0);
SharedPreferences.Editor editor = prefs.edit();
editor.putInt(arrayName +"_size", array.length);
for(int i=0;i<array.length;i++)
editor.putString(arrayName + "_" + i, array[i]);
return editor.commit();
}
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05-08 23:10:51.329: I/Process(495): Sending signal. PID: 495 SIG: 9
05-08 23:11:02.360: D/dalvikvm(504): GC_EXTERNAL_ALLOC freed 44K, 53% free 2553K/5379K, external 1625K/2137K, paused 221ms
05-08 23:11:08.599: D/dalvikvm(504): GC_EXTERNAL_ALLOC freed 16K, 51% free 2644K/5379K, external 2707K/3308K, paused 174ms
05-08 23:11:12.570: D/AndroidRuntime(504): Shutting down VM
05-08 23:11:12.570: W/dalvikvm(504): threadid=1: thread exiting with uncaught exception (group=0x40015560)
05-08 23:11:12.599: E/AndroidRuntime(504): FATAL EXCEPTION: main
05-08 23:11:12.599: E/AndroidRuntime(504): java.lang.NullPointerException
05-08 23:11:12.599: E/AndroidRuntime(504): at starting.rt.Base$1.onClick(Base.java:52)
05-08 23:11:12.599: E/AndroidRuntime(504): at android.view.View.performClick(View.java:2485)
05-08 23:11:12.599: E/AndroidRuntime(504): at android.view.View$PerformClick.run(View.java:9080)
05-08 23:11:12.599: E/AndroidRuntime(504): at android.os.Handler.handleCallback(Handler.java:587)
05-08 23:11:12.599: E/AndroidRuntime(504): at android.os.Handler.dispatchMessage(Handler.java:92)
05-08 23:11:12.599: E/AndroidRuntime(504): at android.os.Looper.loop(Looper.java:123)
05-08 23:11:12.599: E/AndroidRuntime(504): at android.app.ActivityThread.main(ActivityThread.java:3683)
05-08 23:11:12.599: E/AndroidRuntime(504): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 23:11:12.599: E/AndroidRuntime(504): at java.lang.reflect.Method.invoke(Method.java:507)
05-08 23:11:12.599: E/AndroidRuntime(504): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-08 23:11:12.599: E/AndroidRuntime(504): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-08 23:11:12.599: E/AndroidRuntime(504): at dalvik.system.NativeStart.main(Native Method)
05-08 23:11:17.869: I/Process(504): Sending signal. PID: 504 SIG: 9
我不这么认为,我明白我该把它放在哪里以及它如何提供帮助?不过谢谢。 – jacobohunter 2013-05-08 21:55:30
由于您没有指定哪个按钮点击会导致崩溃,所以当您点击'fav'按钮时,我认为它崩溃了。所以我在'fav.setOnClickListener(new View.OnClickListener()'的'OnClick()'里面看到它可能会导致崩溃,因为loadArray函数返回的是String [],并且你没有指定返回参数。它不是问题,请指定哪个按钮导致错误?也发布错误的LogCat。这将是有帮助的。 – 2013-05-08 22:00:21
这是最喜欢的按钮。对不起,没有指定。 – jacobohunter 2013-05-08 22:08:39