Question

我正在构建SD卡中所有视频的列表视图，但在启动此Activity时，应用程序没有响应。控制台中也没有关于运行时异常的消息。

public class VideoList extends Activity {

ListView listView;
LinearLayout nov;
String lan;
String videoList[];

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    listView = (ListView) findViewById(android.R.id.list);
    lan = getIntent().getExtras().getString("lang");
    nov = (LinearLayout) findViewById(R.id.nov);
    Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
    String[] projection = { MediaStore.Video.VideoColumns.DISPLAY_NAME };
    Cursor c = getContentResolver()
            .query(uri, projection, null, null, null);
    if (c == null)
        nov.setVisibility(View.VISIBLE);
    int i = 0;
    videoList = new String[c.getCount()];
    while (c.moveToNext()) {
        videoList[i++] = c.getString(0);
    }
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1,
            videoList);
    setContentView(R.layout.videolist);
    listView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub
            Intent i = new Intent(VideoList.this, Subactivity.class);
            i.putExtra("lang", lan);
            i.putExtra("name", arg0.getItemAtPosition(arg2).toString());
            startActivity(i);
        }
    });

}


 }

这是videolist.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
   <LinearLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/nov"
    android:visibility="gone"
    android:orientation="vertical">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:fontFamily="san serif"
        android:gravity="center"
        android:paddingTop="100dp"
        android:text="No videos found"
        android:textSize="16sp" />

</LinearLayout>
   <ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@android:id/list"
   android:fontFamily="san serif"
></ListView>

</LinearLayout>

Answer 1

试试这个..

在初始化setContentView和ListView

之前添加LinearLayout

@Override
protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.videolist);

修改

if (c == null || c.getCount() <= 0) nov.setVisibility(View.VISIBLE);

加载Activity时停止应用程序

1 个答案: