Question

我正在设计一个Android应用程序，我想在EditText中插入一个字符后才显示列表视图。以下是我的代码......

activity_user.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_user"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="manikz.user_interface.UserActivity">
<EditText
    android:id="@+id/editText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:drawableLeft="@android:drawable/ic_menu_search"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:ems="10"
    android:hint="Search"
    android:inputType="textPersonName"
    android:focusable="false"
    android:focusableInTouchMode="false" />
<TextView
    android:id="@+id/textView4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignEnd="@+id/textView"
    android:layout_alignRight="@+id/textView"
    android:layout_below="@+id/textView2"
    android:layout_marginTop="84dp"
    android:text="bruce"
    android:textSize="20dp"
    android:textStyle="bold"
    android:textColor="#ffffff"/>

<TextView
    android:id="@+id/textView11"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="EXTENDLESS"
    android:textColor="#ffffff"
    android:textSize="30dp"
    android:layout_alignTop="@+id/textView4"
    android:layout_toRightOf="@+id/textView12"
    android:layout_toEndOf="@+id/textView12" />

<TextView
    android:id="@+id/textView10"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="iffy"
    android:textSize="29dp"
    android:textStyle="bold"
    android:rotation="-90"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView2"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

<TextView
    android:id="@+id/textView12"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:text="pock"
    android:rotation="90"
    android:textSize="24dp"
    android:textStyle="bold"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView7"
    android:layout_alignRight="@+id/textView2"
    android:layout_alignEnd="@+id/textView2" />

<TextView
    android:id="@+id/textView9"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Polyandry"
    android:textSize="25dp"
    android:textStyle="bold"
    android:layout_marginTop="18dp"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView11"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginLeft="14dp"
    android:layout_marginStart="14dp" />

<TextView
    android:id="@+id/textView5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="flabbergasted"
    android:textSize="27dp"
    android:textColor="#ffffff"
    android:layout_above="@+id/textView3"
    android:layout_toRightOf="@+id/textView3"
    android:layout_toEndOf="@+id/textView3"
    android:layout_marginBottom="12dp" />

<TextView
    android:id="@+id/textView16"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Magnanimous"
    android:textColor="#ffffff"
    android:textSize="40dp"
    android:textStyle="bold"
    android:layout_below="@+id/textView10"
    android:layout_toRightOf="@+id/textView4"
    android:layout_toEndOf="@+id/textView4" />

<TextView
    android:id="@+id/textView8"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="monas"
    android:textSize="40dp"
    android:textStyle="bold"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView6"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:id="@+id/textView7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="early-blooming"
    android:textSize="20dp"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView8"
    android:layout_centerHorizontal="true" />

<TextView
    android:id="@+id/textView13"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Altruist"
    android:textSize="29dp"
    android:textStyle="bold"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView14"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:id="@+id/textView6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="murmuring"
    android:textSize="40dp"
    android:textColor="#ffffff"
    android:layout_alignTop="@+id/textView9"
    android:layout_alignRight="@+id/textView15"
    android:layout_alignEnd="@+id/textView15" />

<TextView
    android:id="@+id/textView15"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Alluring"
    android:textSize="26dp"
    android:rotation="-90"
    android:textColor="#ffffff"
    android:layout_toRightOf="@+id/textView7"
    android:layout_toEndOf="@+id/textView7"
    android:layout_alignBottom="@+id/textView7" />

<TextView
    android:id="@+id/textView14"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Devastating"
    android:textSize="40dp"
    android:textStyle="bold"
    android:textColor="#ffffff"
    android:layout_below="@+id/textView12"
    android:layout_toRightOf="@+id/textView8"
    android:layout_toEndOf="@+id/textView8" />

<TextView
    android:text="Scrumptious"
    android:textColor="#ffffff"
    android:textSize="20dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView14"
    android:layout_centerHorizontal="true"
    android:id="@+id/textView17" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="22dp"
    android:text="cozy"
    android:textSize="40dp"
    android:rotation="90"
    android:textColor="#ffffff"
    android:layout_below="@+id/editText"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="RUCKUS"
    android:textColor="#ffffff"
    android:layout_alignTop="@+id/textView10"
    android:layout_alignLeft="@+id/textView7"
    android:layout_alignStart="@+id/textView7" />

<ListView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/list_view"
    android:layout_below="@+id/editText"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_above="@+id/textView9" />

这是我的活动文件 SecondActivity.java

public class SecondActivity extends AppCompatActivity {
private ListView mSearchNFilterLv;

private EditText mSearchEdt;

private ArrayList<String> mStringList;

private ValueAdapter valueAdapter;

private TextWatcher mSearchTw;

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

        initUI();

        initData();

        valueAdapter = new ValueAdapter(mStringList, this);

        mSearchNFilterLv.setAdapter(valueAdapter);

        mSearchEdt.addTextChangedListener(mSearchTw);

    }

private void initData() {

    mStringList = new ArrayList<String>();

    mStringList.add("one");

    mStringList.add("two");

    mStringList.add("three");

    mStringList.add("four");

    mStringList.add("five");

    mStringList.add("six");

    mStringList.add("seven");

    mStringList.add("eight");

    mStringList.add("nine");

    mStringList.add("ten");

    mStringList.add("eleven");

    mStringList.add("twelve");

    mStringList.add("thirteen");

    mStringList.add("fourteen");

    mSearchTw = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {
          if (s != null && s.toString().trim().length() > 0) {
                mSearchNFilterLv.setVisibility(View.VISIBLE);
                textView1.setVisibility(View.GONE);
                textView2.setVisibility(View.GONE);
                textView3.setVisibility(View.GONE);
                textView4.setVisibility(View.GONE);
                textView5.setVisibility(View.GONE);
                textView6.setVisibility(View.GONE);
                textView7.setVisibility(View.GONE);
                textView8.setVisibility(View.GONE);
                textView9.setVisibility(View.GONE);
                textView10.setVisibility(View.GONE);
                textView11.setVisibility(View.GONE);
                textView12.setVisibility(View.GONE);
                textView13.setVisibility(View.GONE);
                textView14.setVisibility(View.GONE);
                textView15.setVisibility(View.GONE);
                textView16.setVisibility(View.GONE);
                textView17.setVisibility(View.GONE);

            } else {
                mSearchNFilterLv.setVisibility(View.GONE);
                textView1.setVisibility(View.VISIBLE);
                textView2.setVisibility(View.VISIBLE);
                textView3.setVisibility(View.VISIBLE);
                textView4.setVisibility(View.VISIBLE);
                textView5.setVisibility(View.VISIBLE);
                textView6.setVisibility(View.VISIBLE);
                textView7.setVisibility(View.VISIBLE);
                textView8.setVisibility(View.VISIBLE);
                textView9.setVisibility(View.VISIBLE);
                textView10.setVisibility(View.VISIBLE);
                textView11.setVisibility(View.VISIBLE);
                textView12.setVisibility(View.VISIBLE);
                textView13.setVisibility(View.VISIBLE);
                textView14.setVisibility(View.VISIBLE);
                textView15.setVisibility(View.VISIBLE);
                textView16.setVisibility(View.VISIBLE);
                textView17.setVisibility(View.VISIBLE);
            }

            valueAdapter.getFilter().filter(s);
        }
        }
    };
}

private void initUI() {

    mSearchNFilterLv = (ListView) findViewById(R.id.list_view);

    mSearchEdt = (EditText) findViewById(R.id.editTexts);

    mSearchNFilterLv.setVisibility(View.GONE);
    textView1 = (TextView)findViewById(R.id.textView);
    textView2 = (TextView)findViewById(R.id.textView2);
    textView3 = (TextView)findViewById(R.id.textView3);
    textView4 = (TextView)findViewById(R.id.textView4);
    textView5 = (TextView)findViewById(R.id.textView5);
    textView6 = (TextView)findViewById(R.id.textView6);
    textView7 = (TextView)findViewById(R.id.textView7);
    textView8 = (TextView)findViewById(R.id.textView8);
    textView9 = (TextView)findViewById(R.id.textView9);
    textView10 = (TextView)findViewById(R.id.textView10);
    textView11 = (TextView)findViewById(R.id.textView11);
    textView12 = (TextView)findViewById(R.id.textView12);
    textView13 = (TextView)findViewById(R.id.textView13);
    textView14 = (TextView)findViewById(R.id.textView14);
    textView15 = (TextView)findViewById(R.id.textView15);
    textView16 = (TextView)findViewById(R.id.textView16);
    textView1 = (TextView)findViewById(R.id.textView17);
}

}

我希望在EditText中输入字符串时，只有列表视图可见，所有TextView都会被隐藏。欢迎任何帮助。

Answer 1

您的代码的问题在于您在更改文本之前检查edittext，在没有任何内容之前，所以请在更改文本后检查edittext，这是一个示例代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="your text view"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:id="@+id/text_ap"/>

    <ListView
        android:id="@+id/listLikeWhatsapp"
        android:layout_width="match_parent"
        android:layout_above="@id/text_ap"
        android:layout_height="match_parent"/>    

</RelativeLayout>

Answer 2

试试这个

     mSearchTw = new TextWatcher() { 

              @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {

                }

                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {

                }

                @Override
                public void afterTextChanged(Editable s) {
                  if (s != null && s.toString().trim().length() > 0) {
                        mSearchNFilterLv.setVisibility(View.VISIBLE);
                         //Hide the text  here
                    } else {
                        mSearchNFilterLv.setVisibility(View.GONE);
                         //Show the text  here
                    }

                    valueAdapter.getFilter().filter(s);
                }
            };

在编辑文本

2 个答案: