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

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

<?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

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