自定義控件的開發

不少時候,android提供的組件並不能知足咱們的需求,因而咱們不得不按需求開發自定義控件。android

Step 1.app

  寫好自定義控件的內部佈局文件。  ide

<?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:background="@android:color/white"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:paddingBottom="5dip"
        android:paddingLeft="40dip"
        android:paddingTop="5dip"
        android:src="@drawable/confirm" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="8dip"
        android:text="肯定"
        android:textColor="#000000" />

</LinearLayout>

 

 Step 2:佈局

  寫好自定義的控件類並繼承LinearLayout,並寫好相關方法,用於控制自定義控件的內容。this

  

package org.hjw.mybutton;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class my extends LinearLayout {

    private ImageView image;
    private TextView text;

    public my(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater ll = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ll.inflate(R.layout.my_button, this);
        image = (ImageView) findViewById(R.id.image);
        text = (TextView) findViewById(R.id.text);
    }

    public void setImage(int Resid) {
        image.setImageResource(Resid);
    }

    public void setText(String ext) {
        text.setText(ext);
    }

}

Step3:spa

須要使用自定義控件時,只須要在xml文件中加入便可,這裏咱們在主佈局文件中加入。code

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black"
    android:orientation="horizontal" >

    <org.hjw.mybutton.my
        android:id="@+id/myButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
     android:background="@drawable/bg_button"
   /> <org.hjw.mybutton.my android:id="@+id/myButton2" android:layout_width="wrap_content" android:layout_height="wrap_content"
    
android:background="@drawable/bg_button"
     android:layout_marginLeft="5dp">
    </org.hjw.mybutton.my>

</LinearLayout>

Step 4:orm

爲了使用戶體驗效果更好,能夠加入背景圖片的變化效果。xml

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

    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/btn_normal"></item>
    <item android:state_pressed="true" android:drawable="@drawable/btn_white"></item>
    <item android:state_checked="true" android:drawable="@drawable/btn_white"></item>
    <item android:state_focused="false" android:state_pressed="false" android:drawable="@drawable/btn_normal"></item>
    
</selector>

Step 5:blog

最後在主Activity中像使用其餘控件同樣使用此控件。

package org.hjw.mybutton;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

    private my My, My2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        My = (my) findViewById(R.id.myButton1);
        My2 = (my) findViewById(R.id.myButton2);
        My2.setImage(R.drawable.cancel);
        My2.setText("取消");
        My.setImage(R.drawable.confirm);
        My.setText("肯定");

        My.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "You just clicked!", 1)
                        .show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Step 6:

咱們看看效果吧。

╭︿︿︿╮ {/ o  o /}   ( (oo) )     ︶ ︶︶

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