一个小程序：Instrumentation的使用

来源：互联网发布：网络打印机主机ip地址编辑：程序博客网时间：2024/06/15 13:22

本来是想练习Matrix的，没想到写了一个自定义View，监听它的ASWD键后，不知道该如何按下ASWD（手机上一般都没实体按键了）。于是：

一个自定义View：

public class MyView extends View {    private final Bitmap bitmap;    private int width;    private int height;    private Matrix matrix = new Matrix();    private boolean isScale = false;    //设置倾斜度    private float sx = 0.0f;    //缩放比例    private float scale = 1.0f;    public MyView(Context context, AttributeSet attrs) {        super(context, attrs);        //获得位图        bitmap = ((BitmapDrawable) context.getResources().getDrawable(R.drawable.a)).getBitmap();        //获得位图宽        width = bitmap.getWidth();        height = bitmap.getHeight();        //当前视图获得焦点        this.setFocusable(true);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //重置Matrix        matrix.reset();        if (!isScale) {            //旋转Matrix            matrix.setSkew(sx, 0);        } else {            matrix.setScale(scale, scale);        }        //根据原始位图和Matrix创建新图片        Bitmap bitmap1 = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);        //绘制新位图        canvas.drawBitmap(bitmap1, matrix, null);    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        switch (keyCode) {            //向左倾斜            case KeyEvent.KEYCODE_A:                isScale = false;                sx += 0.1;                postInvalidate();                break;            //向右倾斜            case KeyEvent.KEYCODE_D:                isScale = false;                sx -= 0.1;                postInvalidate();                break;            //放大            case KeyEvent.KEYCODE_W:                isScale = true;                if (scale < 2.0)                    scale += 0.1;                postInvalidate();                break;            //缩小            case KeyEvent.KEYCODE_S:                isScale = true;                if (scale > 0.5)                    scale -= 0.1;                postInvalidate();                break;        }        return super.onKeyDown(keyCode, event);    }}

然后是Activity里的实现（把按钮的点击事件传递给WASD）：

public class MatrixActivity extends Activity {    private Button left;    private Button right;    private Button top;    private Button bottom;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_matrix);        left = (Button) findViewById(R.id.left);        right = (Button) findViewById(R.id.right);        top = (Button) findViewById(R.id.top);        bottom = (Button) findViewById(R.id.bottom);        left.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                sendKeyEvent(29);            }        });        right.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                sendKeyEvent(32);            }        });        top.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                sendKeyEvent(51);            }        });        bottom.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                sendKeyEvent(47);            }        });    }    public static void sendKeyEvent(final int KeyCode) {        new Thread() {     //不可在主线程中调用            public void run() {                try {                    Instrumentation inst = new Instrumentation();                    inst.sendKeyDownUpSync(KeyCode);                } catch (Exception e) {                    e.printStackTrace();                }            }        }.start();    }}

0 0