android 列表视图出现问题

Question

我正在尝试将代码写入 android，

tv=(TextView) findViewById(R.id.ringtone);
    if (!hasErrors) {

        setListAdapter(new ArrayAdapter<String>(FindFilesByType.this, R.layout.main,
                Ringtones));

        lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> aView, View v,
                    int position, long id) {
                currentPosition = position;
                playRingtone(DIRECTORY+Ringtones.get(position));
            }
        });

但我正在关注 Logcat，并且我的应用程序强行关闭，

04-27 11:05:08.212: INFO/ActivityManager(52): Starting activity: Intent { cmp=android.com.testHTML/.FindFilesByType }
04-27 11:05:08.353: INFO/NotificationService(52): enqueueToast pkg=android.com.testHTML callback=android.app.ITransientNotification$Stub$Proxy@4394f760 duration=0
04-27 11:05:08.454: ERROR/ArrayAdapter(715): You must supply a resource ID for a TextView
04-27 11:05:08.454: WARN/dalvikvm(715): threadid=3: thread exiting with uncaught exception (group=0x4001aa28)
04-27 11:05:08.454: ERROR/AndroidRuntime(715): Uncaught handler: thread main exiting due to uncaught exception
04-27 11:05:08.473: ERROR/AndroidRuntime(715): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:347)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.AbsListView.obtainView(AbsListView.java:1273)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ListView.makeAndAddView(ListView.java:1658)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ListView.fillDown(ListView.java:637)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ListView.fillFromTop(ListView.java:694)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ListView.layoutChildren(ListView.java:1516)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.AbsListView.onLayout(AbsListView.java:1112)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.View.layout(View.java:6569)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1108)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.LinearLayout.onLayout(LinearLayout.java:920)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.View.layout(View.java:6569)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.View.layout(View.java:6569)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.LinearLayout.onLayout(LinearLayout.java:918)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.View.layout(View.java:6569)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.View.layout(View.java:6569)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.ViewRoot.performTraversals(ViewRoot.java:979)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1613)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.os.Looper.loop(Looper.java:123)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.app.ActivityThread.main(ActivityThread.java:4203)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at java.lang.reflect.Method.invokeNative(Native Method)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at java.lang.reflect.Method.invoke(Method.java:521)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at dalvik.system.NativeStart.main(Native Method)
04-27 11:05:08.473: ERROR/AndroidRuntime(715): Caused by: java.lang.ClassCastException: android.widget.LinearLayout
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:340)
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     ... 30 more
04-27 11:05:08.493: INFO/Process(52): Sending signal. PID: 715 SIG: 3
04-27 11:05:08.493: INFO/dalvikvm(715): threadid=7: reacting to signal 3
04-27 11:05:08.503: ERROR/dalvikvm(715): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
04-27 11:05:13.472: INFO/Process(715): Sending signal. PID: 715 SIG: 9
04-27 11:05:13.503: INFO/ActivityManager(52): Process android.com.testHTML (pid 715) has died.
04-27 11:05:13.512: INFO/WindowManager(52): WIN DEATH: Window{43885018 android.com.testHTML/android.com.testHTML.testHTMLActivity paused=false}
04-27 11:05:13.512: INFO/WindowManager(52): WIN DEATH: Window{43933640 Toast paused=false}
04-27 11:05:13.512: INFO/WindowManager(52): WIN DEATH: Window{439071b0 android.com.testHTML/android.com.testHTML.FindFilesByType paused=false}
04-27 11:05:13.592: INFO/ActivityManager(52): Start proc android.com.testHTML for activity android.com.testHTML/.testHTMLActivity: pid=750 uid=10024 gids={3003, 1015}
04-27 11:05:13.784: INFO/jdwp(750): received file descriptor 20 from ADB
04-27 11:05:13.913: WARN/UsageStats(52): Something wrong here, didn't expect android.com.testHTML to be resumed
04-27 11:05:14.503: WARN/InputManagerService(52): Got RemoteException sending setActive(false) notification to pid 715 uid 10024
04-27 11:05:14.643: INFO/ActivityManager(52): Displayed activity android.com.testHTML/.testHTMLActivity: 1139 ms (total 6398 ms)

我在做什么错？

提前致谢

Answer 1

朋友，您的问题是您正在使用 r.layout.main 作为列表行。

您必须创建一个单独的 listrow 布局，其中仅提及 textview
并将其作为布局传递
您的错误在这一行

setListAdapter(new ArrayAdapter<String>(FindFilesByType.this, R.layout.main,
                Ringtones));

创建一个布局，例如 listrow.xml

<?xml version="1.0" encoding="utf-8"?>
<TexView
.....
/>

并更改您的行

setListAdapter(new ArrayAdapter<String>(FindFilesByType.this, R.layout.listrow,
                    Ringtones));

Answer 2

logcat 明确指出您需要为 textview 提供资源 id，因为您提供的是线性布局（我的猜测是因为它抛出 ClassCastException），我相信您的 main.xml 是线性布局而不是文本视图。而是尝试R.id.ringtone

Answer 3

您的问题在以下几行中进行了描述：

11:05:08.473: ERROR/AndroidRuntime(715): Caused by: java.lang.ClassCastException: android.widget.LinearLayout
04-27 11:05:08.473: ERROR/AndroidRuntime(715):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:340)

这可能意味着您正在使用某些东西作为 LinearLayout，但它不是一个。
（大多数时候你会得到 ClassCastException，你正在做类似的事情
foobar = (LinearLayout) someCode(); )