pjsip视频通信开发(上层应用)之拨号键盘下部份拨号和删除功能

我们开发的是视频电话，所以既可以视频通话，可以只有音频的通话，所以底部含有两个按钮，最后一个就是删除功能，如果输入错误，我们可以删除输入的内容。

这里我们要通过重写LinearLayout来实现这部份，对应着上面的功能我们可以写一个接口来实现这些功能，如下：

public interface OnDialActionListener {
        /**
         * The make call button has been pressed
         */
        void placeCall();

        /**
         * The video button has been pressed
         */
        void placeVideoCall();
        /**
         * The delete button has been pressed
         */
        void deleteChar();
        /**
         * The delete button has been long pressed
         */
        void deleteAll();
    }

通过回调来在主界面实现这些功能。例如在OnClick函数中

 @Override
    public void onClick(View v) {
        if (actionListener != null) {
            int viewId = v.getId();
            if (viewId == R.id.dialVideoButton) {
                actionListener.placeVideoCall();
            }else if(viewId == R.id.dialButton) {
                actionListener.placeCall();
            }else if(viewId == R.id.deleteButton) {
                actionListener.deleteChar();
            }
        }
    }

我们可以通过本地的接口来实现内部函数，然后在主界面实例化这个接口并填写接口的实现方式。整体的代码如下：

package com.jwzhangjie.pjsip.widgets;

import com.jwzhangjie.pjsip.R;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.widget.LinearLayout;

public class DialerCallBar extends LinearLayout implements OnClickListener, OnLongClickListener {

    public interface OnDialActionListener {
        /**
         * The make call button has been pressed
         */
        void placeCall();

        /**
         * The video button has been pressed
         */
        void placeVideoCall();
        /**
         * The delete button has been pressed
         */
        void deleteChar();
        /**
         * The delete button has been long pressed
         */
        void deleteAll();
    }

    private OnDialActionListener actionListener;
    
    public DialerCallBar(Context context) {
        this(context, null, 0);
    }

    public DialerCallBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    
    public DialerCallBar(Context context, AttributeSet attrs, int style) {
        super(context, attrs);
        LayoutInflater inflater = LayoutInflater.from(context);
        inflater.inflate(R.layout.dialpad_additional_buttons, this, true);
        findViewById(R.id.dialVideoButton).setOnClickListener(this);
        findViewById(R.id.dialButton).setOnClickListener(this);
        findViewById(R.id.deleteButton).setOnClickListener(this);
        findViewById(R.id.deleteButton).setOnLongClickListener(this);
        
        if(getOrientation() == LinearLayout.VERTICAL) {
            LayoutParams lp;
            for(int i=0; i < getChildCount(); i++) {
                lp = (LayoutParams) getChildAt(i).getLayoutParams();
                int w = lp.width;
                lp.width = lp.height;
                lp.height = w;
                lp.gravity = Gravity.CENTER_HORIZONTAL;
                // Added for clarity but not necessary
                getChildAt(i).setLayoutParams(lp);
                
            }
        }
    }

    /**
     * Set a listener for this widget actions
     * @param l the listener called back when some user action is done on this widget
     */
    public void setOnDialActionListener(OnDialActionListener l) {
        actionListener = l;
    }
    
    /**
     * Set the action buttons enabled or not
     */
    public void setEnabled(boolean enabled) {
        findViewById(R.id.dialButton).setEnabled(enabled);
        findViewById(R.id.dialVideoButton).setEnabled(enabled);
        findViewByI