我是Android新手，我正在关注创建搜索界面的this教程。
我的可搜索配置xml文件：
<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="@string/app_name"
android:hint ="@string/search_hint"
>
</searchable>
mainactivity文件内容：
package com.searchingapp.android;
import android.app.Activity;
import android.app.SearchManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
**EDIT**
EditText edittext = (EditText) findViewById(R.id.editText1);
button.setOnClickListener( new View.OnClickListener()
{
public void onClick(View arg0)
{
onSearchRequested();
}
});
}
}
searchActivity文件内容：
package com.searchingapp.android;
import android.app.Activity;
import android.app.SearchManager;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class Searchactivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_searchactivity);
Intent intent = getIntent();
if ( Intent.ACTION_SEARCH.equals( intent.getAction() ) )
{
String search_query = intent.getStringExtra(SearchManager.QUERY);
TextView search_text = (TextView) findViewById(R.id.textView1);
search_text.setText(search_query);
}
}
}
最后主要文件我认为问题出现在这个文件中：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.searchingapp.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" >
<activity
android:name="com.searchingapp.android.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.default_searchable"
android:value=".Searchactivity" />
________________________/\_______________
here
</activity>
<activity
android:name=".Searchactivity" >
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data android:name="android.app.searchable"
android:resource="@xml/searchable"/>
</activity>
</application>
</manifest>
编辑：
logcat输出：
06-16 01:16:33.778: D/AndroidRuntime(1224): Shutting down VM
06-16 01:16:33.778: W/dalvikvm(1224): threadid=1: thread exiting with uncaught exception (group=0xadac0ba8)
06-16 01:16:33.818: E/AndroidRuntime(1224): FATAL EXCEPTION: main
06-16 01:16:33.818: E/AndroidRuntime(1224): Process: com.searchingapp.android, PID: 1224
06-16 01:16:33.818: E/AndroidRuntime(1224): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.searchingapp.android/com.searchingapp.android.MainActivity}: java.lang.ClassCastException: android.widget.EditText cannot be cast to android.widget.Button
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.os.Handler.dispatchMessage(Handler.java:102)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.os.Looper.loop(Looper.java:136)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-16 01:16:33.818: E/AndroidRuntime(1224): at java.lang.reflect.Method.invokeNative(Native Method)
06-16 01:16:33.818: E/AndroidRuntime(1224): at java.lang.reflect.Method.invoke(Method.java:515)
06-16 01:16:33.818: E/AndroidRuntime(1224): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-16 01:16:33.818: E/AndroidRuntime(1224): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-16 01:16:33.818: E/AndroidRuntime(1224): at dalvik.system.NativeStart.main(Native Method)
06-16 01:16:33.818: E/AndroidRuntime(1224): Caused by: java.lang.ClassCastException: android.widget.EditText cannot be cast to android.widget.Button
06-16 01:16:33.818: E/AndroidRuntime(1224): at com.searchingapp.android.MainActivity.onCreate(MainActivity.java:17)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.Activity.performCreate(Activity.java:5231)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-16 01:16:33.818: E/AndroidRuntime(1224): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
06-16 01:16:33.818: E/AndroidRuntime(1224): ... 11 more
06-16 01:16:50.848: I/Process(1224): Sending signal. PID: 1224 SIG: 9
新的catlog输出：
06-16 01:31:01.168: D/AndroidRuntime(1459): Shutting down VM
06-16 01:31:01.168: W/dalvikvm(1459): threadid=1: thread exiting with uncaught exception (group=0xadac0ba8)
06-16 01:31:01.198: E/AndroidRuntime(1459): FATAL EXCEPTION: main
06-16 01:31:01.198: E/AndroidRuntime(1459): Process: com.searchingapp.android, PID: 1459
06-16 01:31:01.198: E/AndroidRuntime(1459): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.searchingapp.android/com.searchingapp.android.Searchactivity}: java.lang.NullPointerException
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.os.Handler.dispatchMessage(Handler.java:102)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.os.Looper.loop(Looper.java:136)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-16 01:31:01.198: E/AndroidRuntime(1459): at java.lang.reflect.Method.invokeNative(Native Method)
06-16 01:31:01.198: E/AndroidRuntime(1459): at java.lang.reflect.Method.invoke(Method.java:515)
06-16 01:31:01.198: E/AndroidRuntime(1459): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-16 01:31:01.198: E/AndroidRuntime(1459): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-16 01:31:01.198: E/AndroidRuntime(1459): at dalvik.system.NativeStart.main(Native Method)
06-16 01:31:01.198: E/AndroidRuntime(1459): Caused by: java.lang.NullPointerException
06-16 01:31:01.198: E/AndroidRuntime(1459): at com.searchingapp.android.Searchactivity.onCreate(Searchactivity.java:23)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.Activity.performCreate(Activity.java:5231)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-16 01:31:01.198: E/AndroidRuntime(1459): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
06-16 01:31:01.198: E/AndroidRuntime(1459): ... 11 more
任何人都可以告诉我我在做愚蠢的事情。
答案 0 :(得分：0)
我觉得你在这里做的很蠢。 ;）
android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"
使用
Theme.AppCompat主题，因为Searchactivity extends ActionBarActivity
解决方案＃2：
当您需要全屏活动然后从ActionBarActivity延伸Searchactivity从Activity延伸
答案 1 :(得分：0)
这是问题
Button button = (Button) findViewById(R.id.editText1);
您正在向按钮投射edittext。
根据将其转换为edittext，或使用xml中的按钮进行更改。