android - 有没有办法在android 2.1中不使用动画来旋转按钮

Question

我正在寻找旋转按钮的方法。不使用动画..!

我不想使用动画因为 this.

如果有人有任何想法，请帮助我。

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" android:id="@+id/ll" android:gravity="center_vertical">
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="@string/hello" />
    <com.mind.RotateButton android:layout_width="100dp"  android:gravity="center_vertical"
        android:layout_height="100dp" android:id="@+id/ll1">
    <Button android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:text="Button" android:id="@+id/but" />
    </com.mind.RotateButton>
</LinearLayout>

代码

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);      
        Button btn   = (Button) findViewById(R.id.but);     
        btn.setOnClickListener(new OnClickListener() {          
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "Hello", Toast.LENGTH_SHORT).show();                
            }
        });
    }

提前致谢......!

Answer 1

扩展按钮类:

public class RotateButton extends Button{

    public RotateButton(Context context) {
        super(context);
    }

    public RotateButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.save();
        canvas.rotate(45, getWidth() / 2, getHeight() / 2);
        super.onDraw(canvas);
        canvas.restore();
    }

}

在你的布局中:

<com.samples.myapp.ui.RotateButton
        android:layout_height="wrap_content" android:id="@+id/MyBtn"
        android:padding="5dip" android:textColor="@color/darkGreen"
        android:textSize="16dip" android:text="TextView"
        android:layout_width="wrap_content"></com.samples.myapp.ui.RotateButton>

-------------------------------------------- --------------------------

编辑:

另一种方法:设计一个可旋转的 LinearLayout 并将您的控件放入其中。 LinearLayout 可以完全旋转:

package org.mabna.order.ui;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.MotionEvent;

public class RotateLinearLayout extends LinearLayout{

    private Matrix mForward = new Matrix();
    private Matrix mReverse = new Matrix();
    private float[] mTemp = new float[2];

    public RotateLinearLayout(Context context) {
        super(context);
    }

    public RotateLinearLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {

        canvas.rotate(180, getWidth() / 2, getHeight() / 2);

        mForward = canvas.getMatrix();
        mForward.invert(mReverse);
        canvas.save();
        canvas.setMatrix(mForward); // This is the matrix we need to use for
                                    // proper positioning of touch events
        super.dispatchDraw(canvas);
        canvas.restore();
        invalidate();
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        event.setLocation(getWidth() - event.getX(), getHeight() - event.getY());
        return super.dispatchTouchEvent(event);
    }
}