文件打开对话框应用程序意外停止

Question

我已经在android中编写了文件对话框的代码并且它运行得很完美但是今天当我运行代码时我的应用程序意外崩溃了。我编写了文件对话框应用程序，它显示了ListView中的所有路径。

我的完整活动代码如下：

public class MainActivity extends ListActivity {

    private List<String> item = null;
    private List<String> path = null;
    private String root;
    private TextView myPath;
            static private String pos;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        View v= findViewById(R.id.rowtext);


        myPath = (TextView)findViewById(R.id.path);

        root = Environment.getExternalStorageDirectory().getPath();

        getDir(root);



    }

    public void bt_Quit(View v)
    {
        finish();
    }

    public  void back(View v)
    {
        getDir(pos);

    }
    public  void home(View v)
    {
        getDir(root);

    }

    private void getDir(String dirPath)
    {


        myPath.setText("Location: " + dirPath);
        item = new ArrayList<String>();
        path = new ArrayList<String>();
        File f = new File(dirPath);
        File[] files = f.listFiles();
               pos=f.getParent();
        if(!dirPath.equals(root))
        {

        }


        for(int i=0; i < files.length; i++)
        {
            File file = files[i];

            if(!file.isHidden() && file.canRead()){
                path.add(file.getPath());
                if(file.isDirectory()){
                    item.add(file.getName() + "/");
                }else{
                    item.add(file.getName());
                }
            }   
        }

        ArrayAdapter<String> fileList =
                new ArrayAdapter<String>(this, R.layout.row, item);
        setListAdapter(fileList);   
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        File file = new File(path.get(position));
        if (file.isDirectory())
        {
            if(file.canRead()){
                getDir(path.get(position));

            }else{
                new AlertDialog.Builder(this)
                    .setIcon(R.drawable.ic_launcher)
                    .setTitle("[" + file.getName() + "] folder can't be read!")
                    .setPositiveButton("OK", null).show();  
            }   
        }else {
            new AlertDialog.Builder(this)
                    .setIcon(R.drawable.ic_launcher)
                    .setTitle("[" + file.getName() + "]")
                    .setPositiveButton("OK", null).show();

          }
    }

}

我的logcat输出是：

java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
    at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:347)
    at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
    at android.widget.AbsListView.obtainView(AbsListView.java:1584)
    at android.widget.ListView.measureHeightOfChildren(ListView.java:1264)
    at android.widget.ListView.onMeasure(ListView.java:1175)
    at android.view.View.measure(View.java:8313)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
    at android.view.View.measure(View.java:8313)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
    at android.view.View.measure(View.java:8313)
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
    at android.view.View.measure(View.java:8313)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
    at android.view.View.measure(View.java:8313)
    at android.view.ViewRoot.performTraversals(ViewRoot.java:845)
    at android.view.ViewRoot.handleMessage(ViewRoot.java:1866)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:130)
    at android.app.ActivityThread.main(ActivityThread.java:3687)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:507)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: java.lang.ClassCastException: android.widget.LinearLayout
    at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:340)
    .

Answer 1

ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, R.layout.row, item);

您需要提供的不是布局资源，而是TextView资源for example：

ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, item);