Android:从PreferenceActivity启动自定义首选项

Question

我希望能够从我的PreferenceActivity中启动第二个Preference屏幕.在第二个首选项屏幕中,我想使用xml中的预定义布局.所以,我有两个问题:

如何使用xml布局作为首选项的布局视图？如何将此自定义首选项添加到PreferenceActivity,以便在轻触时启动？

谢谢

*编辑以回应不在犯罪现场

我试图通过声明要在xml中启动的活动,从首选项屏幕启动活动.这会导致此异常:

 04-01 19:04:37.962: ERROR/AndroidRuntime(8061): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.me/CustomPrefScreen}; have you declared this activity in your AndroidManifest.xml?

*另一个更新.但是,如果我使用Preference的某些扩展名替换了settings.xml中的PrefrenceScreen,它会覆盖onClick()以启动CustomPrefScreen,那么一切正常.

主要偏好活动:

public class MyPreferences extends PreferenceActivity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);
    }
}

的settings.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceScreen  
        android:summary="my summary" 
        android:title="my title">
        <intent android:action="android.intent.action.MAIN"
                    android:targetPackage="com.me"
                    android:targetClass="CustomPrefScreen"/>
    </PreferenceScreen>

</PreferenceScreen>

mainfest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.me"
    android:versionCode="1"
    android:versionName="1.0">
    <application 
        android:icon="@drawable/icon" 
        android:label="@string/app_name" 
        android:theme="@style/Theme.NoBackground">
        <activity 
            android:name=".MyApp"
            android:label="@string/app_name">
            <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
             </activity>
        <activity 
            android:name=".CustomPrefScreen"
            android:label="@string/app_name">
        </activity>
        <activity 
            android:name=".MyPreferences"
            android:label="@string/app_name">
        </activity>
    </application>
    <uses-sdk android:minSdkVersion="4" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest> 

Answer 1

一种解决方案是扩展DialogPreference,允许为首选项对话框设置自定义布局.这样您就会列出首选项,当您点按它时,您会看到一个包含自定义设置UI的对话框.

 <com.xyz.MyPreference 
           android:dialogLayout="@layout/yourlayout"
           android:dialogTitle="Dialog Title"
            android:dialogMessage="Dialog summary"
            android:key="preference_key"
            android:title="Preference Title"
            android:summary="Preference summary"
            android:defaultValue="Default Value" /> 

和班级

class MyPreference extends DialogPreference {
// along with constructors, you will want to override
    @Override
    protected void onBindDialogView(View view) {
        super.onBindDialogView(view);
        // view is your layout expanded and added to the dialog
            // find and hang on to your views here, add click listeners etc
            // basically things you would do in onCreate
        mTextView = (TextView)view.findViewById(R.Id.mytextview);
        }

        @Override
        protected void onDialogClosed(boolean positiveResult) {
           super.onDialogClosed(positiveResult);

            if (positiveResult) {
                // deal with persisting your values here
            }
        }
}

显然还有其他一些细节,但这是基本的想法.

Answer 2

不在场证明的解决方案-一个内限定的意图<PreferenceScreen>入口-工作对我来说,之后的多次试验和错误targetPackage和targetClass领域.

targetPackage需要是我的应用程序的包名称的完整路径(即package=AndroidManifest.xml文件中的条目).targetClass需要是活动的完整路径 - 包含包名称,即使活动与应用程序位于同一个包中.

应用程序的AndroidManifest.xml文件(当然)也需要Activity的条目.我没有<intent-filter>为此条目定义一个,大概是因为actionis MAIN(无论Activity是在与Application相同还是不同的包中都是如此).

示例:Application的包是com.thissocialworld.我想从PreferencesScreen一个名为com.coolcommonActivity的类开始的Activity和Activity类com.thissocialworld.SpecialPreferences.<PreferenceScreen>看起来像这样的条目:

<intent android:action="android.intent.action.MAIN"
 android:targetPackage="com.thissocialworld"
 android:targetClass="com.thissocialworld.SpecialPreferences"/>

我可能会尝试改变action.MAIN,以action.PREFERENCES若有似有必要获得访问PreferencesManager.

(PS我在这里的第一篇文章,我无法弄清楚如何发布这个作为对alibi开始的讨论的评论.)

Answer 3

您可能需要类似于我从库或相机上传照片的操作.

package com.atClass.lmt;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.provider.MediaStore;
import android.util.Log;


public class Prefs extends PreferenceActivity{
    //public static final int FLAG_ACTIVITY_CLEAR_TOP = 1;
    private static final int MEDIA_IMAGE_REQUEST_CODE = 1;
    private static final int CAMERA_IMAGE_REQUEST_CODE = 2;
    public static Uri cImageUri;

    public static Context cContext;
    public static Activity cActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);

        this.cContext = (Context)this;
        this.cActivity = (Activity)this;

        Preference customPref = (Preference) findPreference("user_display_picture");
        customPref.setOnPreferenceClickListener(
                new OnPreferenceClickListener() {
                    public boolean onPreferenceClick(Preference preference) {
                        return imageUploadDialog();
                    }
                });
    }

    protected void onStop(){
        super.onStop();
        MapTools.createMapView(false);
        Lmt.serviceBinder.serviceThread("loginDevice");
    }

    public boolean imageUploadDialog(){
        final CharSequence[] items = {"Take picture now","Upload from gallery"};
        AlertDialog.Builder lAlertDialog = new AlertDialog.Builder(cContext);
        lAlertDialog.setTitle("Upload action");
        lAlertDialog.setCancelable(true);
        lAlertDialog.setItems(items,
                new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialogInterface, int i){
                //Toast.makeText(getApplicationContext(), "Selected item: " +i,  Toast.LENGTH_SHORT).show();
                if (i == 0){
                    attachCameraImage();
                }
                if (i == 1){
                    attachGalleryImage();
                }
            }
        });
        lAlertDialog.setIcon(R.drawable.click_to_url);
        lAlertDialog.show();
        return true;
    }

    public void attachGalleryImage(){
        Intent getImageFromGalleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
        startActivityForResult(getImageFromGalleryIntent, MEDIA_IMAGE_REQUEST_CODE);
    }

    public void attachCameraImage(){
        String fileName = "testphoto.jpg";
        ContentValues values = new ContentValues();
        values.put(MediaStore.Images.Media.TITLE, fileName);
        values.put(MediaStore.Images.Media.DESCRIPTION,"Image capture by camera");
        values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
        cImageUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, cImageUri);
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
        startActivityForResult(intent, CAMERA_IMAGE_REQUEST_CODE);
    }

    protected final void onActivityResult(final int requestCode, final int resultCode, final Intent i) {
        Log.d(Global.TAG,"--> Received callback with:" + resultCode);
        super.onActivityResult(requestCode, resultCode, i);
        if(resultCode == RESULT_OK) {
            Log.d(Global.TAG,"--> Result OK with:" + requestCode);
            switch(requestCode) {
            case MEDIA_IMAGE_REQUEST_CODE:
                Log.d(Global.TAG,"--> MEDIA_IMAGE_REQUEST_CODE");
                Gui.GuiProgressDialog.showLoadingSpinner(cActivity);
                cImageUri = i.getData();
                if (cImageUri == null){Log.d(Global.TAG,"--> ImageURI is null!");}
                Lmt.serviceBinder.serviceThread("uploadMemberPicture");
                break;
            case CAMERA_IMAGE_REQUEST_CODE:
                Log.d(Global.TAG,"--> CAMERA_IMAGE_REQUEST_CODE");
                //cImageUri = i.getData();
                if (cImageUri == null){Log.d(Global.TAG,"--> ImageURI is null!");}
                Lmt.serviceBinder.serviceThread("uploadMemberPicture");
                break;
            }
        }
    }
}