Android开发：自定义记事本样式EditText

实现代码如下：

主方法，main.java

import java.text.SimpleDateFormat;
import java.util.Date;

public class Main extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
MyNote mn = new MyNote(this);
mn.setHeight(380);
layout.addView(mn);

LinearLayout layout1=new LinearLayout(this);
layout1.setOrientation(LinearLayout.HORIZONTAL);
Button button = new Button(this);
button.setText("确定");
button.setWidth(60);
layout1.addView(button);

TextView textview=new TextView(this);
Date date=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
String dateString=sdf.format(date);
textview.setText(dateString);
textview.setWidth(200);
textview.setPadding(60, 0, 0, 0);
layout1.addView(textview);

Button button1=new Button(this);
button1.setText("取消");
button1.setWidth(60);
layout1.addView(button1);

layout.addView(layout1);

this.setContentView(layout);

}
}

主方法中主要实现了整个画布的布局的简单设置。以下是自定义EditText的具体实现方法。

MyNote.java

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.Gravity;
import android.widget.EditText;

public class MyNote extends EditText{

public MyNote(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

protected void onDraw(Canvas canvas){
int lineHeight=this.getLineHeight();
Paint mPaint=getPaint();
mPaint.setColor(Color.GRAY);//文本编辑线
int topPadding=this.getPaddingTop();
int leftPadding=this.getPaddingLeft();
float textSize=getTextSize();
setGravity(Gravity.LEFT|Gravity.TOP);
int y =(int)(topPadding+textSize);
for(int i=0;i canvas.drawLine(leftPadding, y+2, getRight()-leftPadding, y+2, mPaint);
y+=lineHeight;
}
canvas.translate(0, 0);
super.onDraw(canvas);
}
}