java - 拖拽时， stub 中的 ListView 会变黑。

Question

我正在制作一个应用程序，底部有一堆按钮，顶部有一堆 ViewStub。所有按钮都指向一个监听器，并且该监听器在按钮 id 之间切换以决定要扩充哪个 stub 。 因此，如果单击按钮 1，则先前的任何 stub 加载都将被撤消，并且 stub 1 将会膨胀。

现在，在 stub 4 上，我需要一个 ListView ，但拖动列表时似乎出现问题。

我遇到的问题是，当我拖动 ListView 时，它会变黑。

代码如下: 包 com.me.myapp； MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewStub;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class MainActivity extends Activity {
    int stubNum;

    /** Called when the activity is first created. */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        if (savedInstanceState  == null) {
            doStuff((View) findViewById(R.id.button1));
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putInt("stubNum", stubNum);
        Log.d("Jason", "Saving stubNum is " + stubNum);
        // TODO Auto-generated method stub
        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onRestoreInstanceState(savedInstanceState);
        stubNum = savedInstanceState.getInt("stubNum");
        Log.d("Jason", "Saved stubNum is " + stubNum);
        if (findViewById(stubNum) != null)
        {
            ViewStub stub = (ViewStub) findViewById(stubNum);
            View newView = stub.inflate();
            Button button1 = (Button) findViewById(R.id.Button01);
            button1.setVisibility(Button.INVISIBLE);

            Button button2 = (Button) findViewById(R.id.Button02);
            button2.setVisibility(Button.VISIBLE);
        }
    }

    // Implement the OnClickListener callback
    public void doStuff(View v) {
        setContentView(R.layout.main);
        switch (v.getId()) {
            case R.id.button1:
                try
                {
                    stubNum = 1;
                    ViewStub stub = (ViewStub) findViewById(R.id.stub1);
                    if (!(stub.getVisibility() == ViewStub.VISIBLE)) {
                        View newView = stub.inflate();
                        Button button1 = (Button) findViewById(R.id.Button01);
                        button1.setVisibility(Button.INVISIBLE);

                        Button button2 = (Button) findViewById(R.id.Button02);
                        button2.setVisibility(Button.VISIBLE);
                    }
                    stubNum = stub.getId();
                    Log.d("Jason", "stubNum is " + stubNum);
                }
                catch(NullPointerException e)
                {
                    e.printStackTrace();
                }
                break;
            case R.id.button2:
                try
                {
                    stubNum = 2;
                    ViewStub stub = (ViewStub) findViewById(R.id.stub2);
                    if (!(stub.getVisibility() == ViewStub.VISIBLE)) {
                        View newView = stub.inflate();
                        Button button1 = (Button) findViewById(R.id.Button01);
                        button1.setVisibility(Button.INVISIBLE);

                        Button button2 = (Button) findViewById(R.id.Button02);
                        button2.setVisibility(Button.INVISIBLE);
                    }
                    stubNum = stub.getId();
                    Log.d("Jason", "stubNum is " + stubNum);
                }
                catch(NullPointerException e)
                {
                    e.printStackTrace();
                }
                break;
            case R.id.button3:
                try
                {
                    stubNum = 3;
                    ViewStub stub = (ViewStub) findViewById(R.id.stub3);
                    if (!(stub.getVisibility() == ViewStub.VISIBLE)) {
                        View newView = stub.inflate();
                        Button button1 = (Button) findViewById(R.id.Button01);
                        button1.setVisibility(Button.INVISIBLE);

                        Button button2 = (Button) findViewById(R.id.Button02);
                        button2.setVisibility(Button.INVISIBLE);
                    }
                    stubNum = stub.getId();
                    Log.d("Jason", "stubNum is " + stubNum);
                }
                catch(NullPointerException e)
                {
                    e.printStackTrace();
                }
                break;
            case R.id.button4:
                try
                {
                    stubNum = 4;
                    ViewStub stub = (ViewStub) findViewById(R.id.stub4);            
                    if (!(stub.getVisibility() == ViewStub.VISIBLE)) {
                        View newView = stub.inflate();
                        Button button1 = (Button) findViewById(R.id.Button01);
                        button1.setVisibility(Button.INVISIBLE);

                        Button button2 = (Button) findViewById(R.id.Button02);
                        button2.setVisibility(Button.INVISIBLE);
                    }
                    stubNum = stub.getId();
                    Log.d("Jason", "stubNum is " + stubNum);


                }
                catch(NullPointerException e)
                {
                    e.printStackTrace();
                }
                break;
            case R.id.button5:
                try
                {
                    stubNum = 5;
                    ViewStub stub = (ViewStub) findViewById(R.id.stub5);
                    if (!(stub.getVisibility() == ViewStub.VISIBLE)) {
                        View newView = stub.inflate();
                        Button button1 = (Button) findViewById(R.id.Button01);
                        button1.setVisibility(Button.INVISIBLE);

                        Button button2 = (Button) findViewById(R.id.Button02);
                        button2.setVisibility(Button.INVISIBLE);
                    }
                    stubNum = stub.getId();
                    Log.d("Jason", "stubNum is " + stubNum);
                }
                catch(NullPointerException e)
                {
                    e.printStackTrace();
                }
                break;
            default:
                stubNum = 1;
                ViewStub stub = (ViewStub) findViewById(R.id.stub1);
                if (!(stub.getVisibility() == ViewStub.VISIBLE)) {
                    View newView = stub.inflate();
                }
                break;
        }
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/relativeLayout1"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <LinearLayout android:layout_height="wrap_content"
        android:id="@+id/linearLayout1" android:layout_width="match_parent"
        android:layout_alignParentLeft="true"
        android:gravity="center" android:layout_alignParentBottom="true">
        <ImageButton android:src="@drawable/download" android:id="@+id/button1" android:layout_width="60dp" android:layout_height="40dp" android:layout_margin="2dip" android:onClick="doStuff"></ImageButton>
        <ImageButton android:src="@drawable/download" android:id="@+id/button2" android:layout_width="60dp" android:layout_height="40dp" android:layout_margin="2dip" android:onClick="doStuff"></ImageButton>
        <ImageButton android:src="@drawable/download" android:id="@+id/button3" android:layout_width="60dp" android:layout_height="40dp" android:layout_margin="2dip" android:onClick="doStuff"></ImageButton>
        <ImageButton android:src="@drawable/download" android:id="@+id/button4" android:layout_width="60dp" android:layout_height="40dp" android:layout_margin="2dip" android:onClick="doStuff"></ImageButton>
        <ImageButton android:src="@drawable/download" android:id="@+id/button5" android:layout_width="60dp" android:layout_height="40dp" android:layout_margin="2dip" android:onClick="doStuff"></ImageButton>
    </LinearLayout>
    <RelativeLayout android:id="@+id/relativeLayout2"
        android:layout_height="wrap_content" android:layout_width="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true" android:layout_above="@+id/linearLayout1"
        android:background="#ffffff" android:layout_below="@+id/relativeLayout3">
        <ViewStub android:id="@+id/stub1"
               android:inflatedId="@+id/subTree"
               android:layout="@layout/myvarsity"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent" />

        <ViewStub android:id="@+id/stub2"
               android:inflatedId="@+id/subTree"
               android:layout="@layout/livestream"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent" />

        <ViewStub android:id="@+id/stub3"
               android:inflatedId="@+id/subTree"
               android:layout="@layout/shows"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent" />

        <ViewStub android:id="@+id/stub4"
               android:inflatedId="@+id/subTree"
               android:layout="@layout/more"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent" />

        <ViewStub android:id="@+id/stub5"
               android:inflatedId="@+id/subTree"
               android:layout="@layout/settings"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent" />
    </RelativeLayout>
    <RelativeLayout android:id="@+id/relativeLayout3" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_width="match_parent" android:gravity="center_horizontal">
            <Button android:id="@+id/Button02" android:text="Customize" android:layout_height="40dp" android:layout_width="wrap_content" android:layout_alignParentTop="true" android:layout_alignParentRight="true"></Button>
            <Button android:id="@+id/Button01" android:text="Back" android:layout_height="40dp" android:layout_width="wrap_content" android:layout_alignParentTop="true" android:layout_alignParentLeft="true"></Button>
            <TextView android:id="@+id/textView1" android:text="App" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_width="wrap_content" android:layout_centerVertical="true" android:layout_centerHorizontal="true"></TextView>
        </RelativeLayout>
</RelativeLayout>

更多.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativeLayout1" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:gravity="center_horizontal">
    <RelativeLayout android:id="@+id/relativeLayout2"
        android:layout_height="wrap_content" android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" android:layout_width="match_parent">
        <ListView android:id="@+id/moreList"
            android:layout_centerVertical="true" android:layout_width="match_parent"
            android:layout_alignParentLeft="true" android:layout_height="match_parent"></ListView>
    </RelativeLayout>
    <TextView android:id="@+id/textView1" android:textColor="#000000"
        android:text="Morelistview" android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_width="wrap_content" android:layout_below="@+id/relativeLayout2"
        android:layout_alignParentLeft="true"></TextView>
</RelativeLayout>

more_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
    <TextView android:text="" android:id="@+id/moreItem" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>

</RelativeLayout>

Answer 1

android:cacheColorHint = "#00000000"

将此标签用于您的 ListView 。或者您也可以使用

listview.setCacheColorHint()

以编程方式设置它。