android自定义控件(六) 刷新

三种得到LinearInflater的方法

a. LayoutInflater inflater = getLayoutInflater();

b. LayoutInflater localinflater =

(LayoutInflater)context.getSystemService

(Context.LAYOUT_INFLATER_SERVICE);

c. LayoutInflater inflater = LayoutInflater.from(context);

onDraw 方法绘图，invalidate刷新界面。

效果图:

点击一下换颜色





onDraw画完图后,给控件设置点击事件 ,将参数传到控件里,然后invalidate刷新

1.onDraw画图,并增加changeColor方法

[java] view
plaincopy

public class CusView3 extends View {

private int color = 0;

public CusView3(Context context, AttributeSet attrs) {

super(context, attrs);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

Paint mPaint = new Paint();

if (color > 2) {

color = 0;

}

switch (color) {

case 0:

mPaint.setColor(Color.GREEN);

break;

case 1:

mPaint.setColor(Color.RED);

break;

case 2:

mPaint.setColor(Color.BLUE);

break;

default:

break;

}

mPaint.setStyle(Style.FILL);

mPaint.setTextSize(35.0f);

canvas.drawText("点击我刷新", 10, 60, mPaint);

}

public void changeColor() { //为了让外面调用

color++;

}

}

2.布局

[html] view
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<?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"

>

<xue.test.CusView3

android:id="@+id/cusview3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

>

</xue.test.CusView3>

</LinearLayout>

3.画图后 给控件设置点击事件 ,将参数传到控件里,然后invalidate刷新

[java] view
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public class TestCustomViewActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

view3 = (CusView3) findViewById(R.id.cusview3);

// 点击事件

view3.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Message message = new Message();

message.what = 1;

myHandler.sendMessage(message);

}

});

}

Handler myHandler = new Handler() {

// 接收到消息后处理

public void handleMessage(Message msg) {

switch (msg.what) {

case 1:

// 调用方法

view3.changeColor();

// 刷新方法

view3.invalidate();

break;

}

super.handleMessage(msg);

}

};

private CusView3 view3;

}

至于自定义控件占整屏的问题,可能需要用layoutparams

源码下载: http://download.csdn.net/detail/ethan_xue/4152203