huong_dan_lap_trinh_voi_android_11

8/7/2019 huong_dan_lap_trinh_voi_android_11

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B5:Chnh sa file strings.xml trong res\value:M:

Example 3Enter the work

hereHourMinuteAdd work

B6: Time to coding. i ti src\at.exam to mt class mi l CustomViewGroupvi ni dung sau:M:

package at.exam;

import android.content.Context;import android.view.LayoutInflater;import android.widget.CheckBox;import android.widget.LinearLayout;import android.widget.TextView;

public class CustomViewGroup extends LinearLayout {public CheckBox cb;public TextView workContent;public TextView timeContent;public CustomViewGroup(Context context) {

super(context);


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//S dng LayoutInflater gn giao din tronglist.xml cho class ny

LayoutInflater li = (LayoutInflater)this.getContext()

.getSystemService(Context.LAYOUT_INFLATER_SERVICE);li.inflate(R.layout.list, this, true);

//Ly v cc View qua Idcb = (CheckBox) findViewById(R.id.check_work);workContent = (TextView)

findViewById(R.id.work_content);timeContent = (TextView)

findViewById(R.id.time_content);

}}

on code trn gip tanh ngha giao din ca custom ViewGroup mi da trnfile list.xml. Mi ngi cng c th to giao din bng code, ko cn s dng XMLnhng s phc tp hn v mnh cng ko gii thiu y.

B7:To 1 class Work cng trong at.exam th hin cng vic:M:

package at.exam;

public class Work {private String workContent;private String timeContent;private boolean isChecked;

public Work(String workContent, String timeContent){

this.workContent = workContent;

this.timeContent = timeContent;isChecked = false;

}

public String getContent() {return workContent;

}


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public String getTime() {

return timeContent;}

public void setChecked(boolean isChecked) {this.isChecked = isChecked;

}

public boolean isChecked() {return isChecked;

}}

Code rt n gin nn mnh s khng ch thch na.

B8:Chng ta to xong custem ViewGroup, by gi chnh l lc s dng. To 1class mi tn l ListWorkApdapter trong at.exam:M:

package at.exam;

import java.util.ArrayList;import android.content.Context;

import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;importandroid.widget.CompoundButton.OnCheckedChangeListener;

public class ListWorkAdapter extendsArrayAdapter{

ArrayList array;int resource;Context context;


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public ListWorkAdapter(Context context, inttextViewResourceId,

ArrayList objects) {super(context, textViewResourceId, objects);

this.context = context;resource = textViewResourceId;array = objects;

}

//Phng thc xc nh View m Adapter hin th, y chnh l CustomViewGroup

//Bt buc phi Override khi k tha tArrayAdapter

@Override

public View getView(int position, View convertView,ViewGroup parent) {

View workView = convertView;

if (workView == null) {workView = new

CustomViewGroup(getContext());}

//Ly v i tng Work hin tifinal Work work = array.get(position);

if (work != null) {TextView workContent = ((CustomViewGroup)

workView).workContent;TextView timeContent = ((CustomViewGroup)

workView).timeContent;CheckBox checkWork = ((CustomViewGroup)

workView).cb;

//Set s kin khi nh du vo checkboxtrn list

checkWork.setOnCheckedChangeListener(newOnCheckedChangeListener() {

@Override


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public voidonCheckedChanged(CompoundButton buttonView,

boolean isChecked) {work.setChecked(isChecked);

}});

//Ly v ni dung cho TextView v CheckBoxda vo i tng Work hin ti

workContent.setText(work.getContent());timeContent.setText(work.getTime());checkWork.setChecked(work.isChecked());

}return workView;

}}

ListWorkAdapter s c s dng thay th cho ArrayAdapter c bind viListView. Thng thng ArrayAdapter ch cho hin th String bng TextView,nhng vi vic k tha v override phng thc getView, ta c th nh ngha lihin th cho cc thnh phn ca ListView.

huong_dan_lap_trinh_voi_android_11

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