extends TextView to create customized widget : TextView « UI « Android

1. Android
2. UI
3. TextView

extends TextView to create customized widget

    
package app.test;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

class TodoListItemView extends TextView {

  private Paint marginPaint;
  private Paint linePaint;
  private int paperColor;
  private float margin;

  public TodoListItemView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
  }
  private void init() {
    marginPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    marginPaint.setColor(Color.RED);
    linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    linePaint.setColor(Color.BLUE);
    paperColor = Color.YELLOW;
    margin = Color.CYAN;
  }

  @Override
  public void onDraw(Canvas canvas) {
    canvas.drawColor(paperColor);
    canvas.drawLine(0, 0, getMeasuredHeight(), 0, linePaint);
    canvas.drawLine(0, getMeasuredHeight(), getMeasuredWidth(),
        getMeasuredHeight(), linePaint);
    canvas.drawLine(margin, 0, margin, getMeasuredHeight(), marginPaint);
    canvas.save();
    canvas.translate(margin, 0);
    super.onDraw(canvas);
    canvas.restore();
  }
}
public class Test extends Activity {
  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    ListView myListView = (ListView) findViewById(R.id.myListView);
    final EditText myEditText = (EditText) findViewById(R.id.myEditText);
    final ArrayList<String> todoItems = new ArrayList<String>();
    int resID = R.layout.row;
    final ArrayAdapter<String> aa = new ArrayAdapter<String>(this, resID,
        todoItems);
    myListView.setAdapter(aa);
    myEditText.setOnKeyListener(new OnKeyListener() {
      public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN)
          if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
            todoItems.add(0, myEditText.getText().toString());
            myEditText.setText("");
            aa.notifyDataSetChanged();
            return true;
          }
        return false;
      }
    });
  }
}

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <EditText
    android:id="@+id/myEditText"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="New To Do Item"
  />
  <ListView  
    android:id="@+id/myListView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
  />
</LinearLayout>
//row.xml

<?xml version="1.0" encoding="utf-8"?>
<app.test.TodoListItemView 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:padding="10dp"
  android:scrollbars="vertical"
  android:fadingEdge="vertical"
/> 

   
    
    
    
  

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