自定义Preference

在系统的preference中，默认布局中包含了一个ImageView、2个TextView和一个LinearLayout布局。在使用Preference的时候，可以通过使用为Preference指定布局来替换原有的系统布局，不过如果只是简单的改变显示布局，可以通过设置setLayoutResource(int layoutId) 函数实现。但是这样做无法对布局中的事件单独设置点击事件。如果需要设置点击事件的话，需要我们自定义Preference。

MainActivity.java

package com.example.custompreferencedemo;

import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.os.Bundle;

public class MainActivity extends PreferenceActivity {

    private Preference _System_Preference;
    private PreferenceWithCustomId _Custom_Id_Preference;
    private PreferenceWithSystemId _System_Id_Preference;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preference_xml);
        _InitPreference();
    }

    private void _InitPreference(){
        _System_Preference = findPreference("system_preference");
        _Custom_Id_Preference = (PreferenceWithCustomId)findPreference("custom_id_preference");
        _System_Id_Preference = (PreferenceWithSystemId)findPreference("system_id_preference");
        _System_Preference.setLayoutResource();
    }
}

PreferenceWithSystemId.java

package com.example.custompreferencedemo;

import android.content.Context;
import android.preference.Preference;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by zhuyuqiang on 2016/11/10.
 */
public class PreferenceWithSystemId extends Preference {
    private TextView _System_Title;
    private ImageView _System_Icon;
    private LayoutInflater _Inflater;
    private String _Title_Content;
    public PreferenceWithSystemId(Context context) {
        this(context,null);
    }

    public PreferenceWithSystemId(Context context, AttributeSet attrs) {
        super(context, attrs);
        _Inflater = LayoutInflater.from(context);
    }

    @Override
    protected View onCreateView(ViewGroup parent) {
        super.onCreateView(parent);
        Log.i("zyq_custom_preference","System_onCreateView");
        View mRootView = _Inflater.inflate(R.layout.custom_preference_layout_with_system_id,null);
        _System_Title = (TextView)mRootView.findViewById(android.R.id.title);
        _System_Icon = (ImageView)mRootView.findViewById(android.R.id.icon);
        _System_Icon.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(),"_System_Icon",Toast.LENGTH_SHORT).show();
            }
        });
        _System_Title.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(),"_System_Title",Toast.LENGTH_SHORT).show();
            }
        });
        _Title_Content = _System_Title.getText().toString();
        return mRootView;
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        Log.i("zyq_custom_preference","System_onBindView");
    }
}

PreferenceWithCustomId.java
package com.example.custompreferencedemo;

import android.content.Context;
import android.preference.Preference;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by zhuyuqiang on 2016/11/10.
 */
public class PreferenceWithCustomId extends Preference {
    private TextView _Custom_Title;
    private ImageView _Custom_Icon;
    private LayoutInflater _Inflater;
    private String _Title_Content;
    public PreferenceWithCustomId(Context context) {
        this(context,null);
    }

    public PreferenceWithCustomId(Context context, AttributeSet attrs) {
        super(context, attrs);
        _Inflater = LayoutInflater.from(context);
    }



    @Override
    protected View onCreateView(ViewGroup parent) {
        super.onCreateView(parent);
        Log.i("zyq_custom_preference","Custom_onCreateView");
        View mRootView = _Inflater.inflate(R.layout.custom_preference_layout_with_custom_id,null);
        _Custom_Title = (TextView)mRootView.findViewById(R.id.custom_title);
        _Custom_Icon = (ImageView)mRootView.findViewById(R.id.custom_icon);
       _Custom_Icon.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               Toast.makeText(getContext(),"_Custom_Icon",Toast.LENGTH_SHORT).show();
           }
       });
        _Custom_Title.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(),"_Custom_Title",Toast.LENGTH_SHORT).show();
            }
        });
        _Title_Content = _Custom_Title.getText().toString();
        return mRootView;
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        Log.i("zyq_custom_preference","Custom_onBindView");
        _Custom_Title.setText(_Title_Content);
    }
}

preference_xml.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory>
        <Preference
            android:key="system_preference"
            android:icon="@mipmap/ic_launcher"
            android:summary="系统Preference"
            android:title="系统Preference"></Preference>
    </PreferenceCategory>
    <PreferenceCategory>
        <com.example.custompreferencedemo.PreferenceWithCustomId
            android:key="custom_id_preference"/>
    </PreferenceCategory>
    <PreferenceCategory>
        <com.example.custompreferencedemo.PreferenceWithSystemId
            android:key="system_id_preference"
            android:title="System_Title"
            android:icon="@mipmap/ic_launcher"/>
    </PreferenceCategory>
</PreferenceScreen>
custom_preference_layout_with_custom_id.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:orientation="horizontal">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/custom_title"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Custom_title" />

    <ImageView
        android:id="@+id/custom_icon"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal|right"
        android:layout_marginRight="15dp"
        android:layout_weight="1"
        android:src="@mipmap/ic_launcher" />
</LinearLayout>
custom_preference_layout_with_system_id.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:minHeight="?android:attr/listPreferredItemHeight"
    android:orientation="horizontal">

    <TextView
        android:gravity="center"
        android:id="@android:id/title"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <ImageView
        android:id="@android:id/icon"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal|right"
        android:layout_marginRight="15dp"
        android:layout_weight="1" />
</LinearLayout>
其中布局中如果直接使用android系统id，可以直接在Preference的xml中进行内容设定，如上述代码所示，测试证明，自定义的preference中的点击事件可以响应，不过一般不会这么使用。一般会在自定义的preference中添加一个接口，通过接口在activity中实现布局中控件的点击方法。