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我已经在 android 中为文件对话框编写了代码，它运行良好，但是今天当我运行代码时，我的应用程序意外崩溃。我已经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)
    .
4

1 回答 1

0 
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，例如：

ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, item);
于 2013-07-26T10:46:18.037 回答