Question

在我AutoCompleteTextView中学习Android的过程中，我成功地做出了AutoCompleteTextView预测。现在，我想通过单击预测从一个Activity切换到另一个Ric。就像输入Richard Nixon一样，我预测Activity并点击了理查德尼克森＆＃39;它带我到另一个package com.mavenmaverick.autocomplete_test; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.Toast; import android.view.inputmethod.InputMethodManager; public class MainActivity extends Activity { String[] presidents= {"Rahul", "John F. Kennedy", "Lyndon B. Johnson", "Richard Nixon", "Gerald Ford", "Jimmy Carter", "Ronald Reagan", "George H. W. Bush", "Bill Clinton", "George W. Bush", "Barack Obama" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1); ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.select_dialog_item, presidents); textView.setThreshold(3); textView.setAdapter(adapter); textView.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int index, long id) { int position=0; if(position == 1){ Intent i = new Intent (MainActivity.this, SecondActivity.class); i.putExtra("KEY", presidents[index]); startActivity(i); } } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } }); } }。我已经为此编写了代码，但它似乎没有用。请帮忙。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mavenmaverick.autocomplete_test"
    android:versionCode="1"
    android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="18" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.mavenmaverick.autocomplete_test.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

Autocomplete

的Manifest.xml：

{{1}}

Answer 1

我不知道你是否已经解决了问题，但如果你没有解决问题，那么你可以采取以下措施来解决问题。您应该使用OnItemClickListener（）而不是OnItemSelectedListener（）。我在AdapterView中找不到这两者之间的区别，但我可以说在调试代码时从未调用它（OnItemSelectedListener（））。这是替代品：

textView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int index, long id) {
            if(index == 1){
                Intent i = new Intent (MainActivity.this, SecondActivity.class);
                i.putExtra("KEY", presidents[index]);
                startActivity(i);
            }
        }
    });

另请注意，onItemClick（）中的索引是单击项目的位置。因此，如果您单击下拉列表中的第一个项目（index = 0），即“比尔克林顿”，则将“Rahul”作为意图的额外内容。

根据您的新问题进行编辑。请执行以下操作：

textView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int index, long id) {
        String president = ((TextView) view).getText().toString();
        Intent intent = null;

        if (president.equals("John F. Kennedy"))
            intent = new Intent (MainActivity.this, KennedyActivity.class);
        if (president.equals("Lyndon B. Johnson"))
            intent = new Intent (MainActivity.this, JohnsonActivity.class);
        if (president.equals("Richard Nixon"))
            intent = new Intent (MainActivity.this, NixonActivity.class);
        if (president.equals("Gerald Ford"))
            intent = new Intent (MainActivity.this, FordActivity.class);
        if (president.equals("Jimmy Carter"))
            intent = new Intent (MainActivity.this, CarterActivity.class);
        if (president.equals("Ronald Reagan"))
            intent = new Intent (MainActivity.this, ReaganActivity.class);
        if (president.equals("George H. W. Bush"))
            intent = new Intent (MainActivity.this, SrBushActivity.class);
        if (president.equals("Bill Clinton"))
            intent = new Intent (MainActivity.this, ClintonActivity.class);
        if (president.equals("George W. Bush"))
            intent = new Intent (MainActivity.this, JrBushActivity.class);
        if (president.equals("Barack Obama"))
            intent = new Intent (MainActivity.this, ObamaActivity.class);

        if (intent != null) {
            intent.putExtra("KEY", president);
            startActivity(intent);
        }
    }
});

Answer 2

Rahul，你出错了，

int position = 0;
if(position == 1) { ...

将您的职位初始化为0将永远不会将您的条件设为真，请参阅您的代码

 @Override
    public void onItemSelected(AdapterView<?> parent, View view,
               int index, long id)
    {
    int position=0; // Setting position to 0 always and your condition will never be true
    if(position == 1){
        Intent i = new Intent (MainActivity.this, SecondActivity.class);
        i.putExtra("KEY", presidents[index]);
        startActivity(i);
        }
    }

Answer 3

在您的清单文件中添加此代码。标签上方。

<activity
    android:name="com.mavenmaverick.autocomplete_test.SecondActivity"
    android:label="@string/app_name" >

</activity>

在AutoCompleteTextView中选择选项时不切换到另一个Activity

3 个答案: