button button点击事件 - Android:使用带有setOnClickListener / onClick的SWITCH语句超过1个按钮?



button样式 setonclicklistener用法 (6)

在OnCreate方法中: -

{

    Button b = (Button)findViewById(R.id.button1);
    b.setOnClickListener((View.OnClickListener)this);

    b = (Button)findViewById(R.id.button2);
    b.setOnClickListener((View.OnClickListener)this);
} 

@Override
public void OnClick(View v){

    switch(v.getId()){
         case R.id.button1:
             //whatever
             break;

         case R.id.button2:
             //whatever
             break;
}

假设我在LinearLayout中有几个按钮,其中2个是:

mycards_button = ((Button)this.findViewById(R.id.Button_MyCards));
exit_button = ((Button)this.findViewById(R.id.Button_Exit));

我在两个上都注册了setOnClickListener()

mycards_button.setOnClickListener(this);
exit_button.setOnClickListener(this);

如何使SWITCH区分Onclick中的两个按钮?

public void onClick(View v) {
  switch(?????){
    case ???:
      /** Start a new Activity MyCards.java */
      Intent intent = new Intent(this, MyCards.class);
      this.startActivity(intent);
      break;
    case ???:
      /** AlerDialog when click on Exit */
      MyAlertDialog();
      break;
}

使用:

  public void onClick(View v) {

    switch(v.getId()){

      case R.id.Button_MyCards: /** Start a new Activity MyCards.java */
        Intent intent = new Intent(this, MyCards.class);
        this.startActivity(intent);
        break;

      case R.id.Button_Exit: /** AlerDialog when click on Exit */
        MyAlertDialog();
        break;
    }
}

请注意,这不适用于Android库项目(由于http://tools.android.com/tips/non-constant-fields ),您需要使用以下内容:

int id = view.getId();
if (id == R.id.Button_MyCards) {
    action1();
} else if (id == R.id.Button_Exit) {
    action2();
}

另一种选择是在setOnClickListener()中添加一个新的OnClickListener作为参数,并覆盖onClick() - 方法:

mycards_button = ((Button)this.findViewById(R.id.Button_MyCards)); 
exit_button = ((Button)this.findViewById(R.id.Button_Exit));

// Add onClickListener to mycards_button
mycards_button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        // Start new activity
        Intent intent = new Intent(this, MyCards.class);
        this.startActivity(intent);
    }
});

// Add onClickListener to exit_button
exit_button.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        // Display alertDialog
        MyAlertDialog();
    }
});

而且还有第三种选择。 在onCreate()方法中,找到您拥有的所有按钮视图,并将它们保存为类数据成员。 然后,您可以级联一组if-else语句以查找哪个。 它有点乱,但如果你不知道按钮的ID(如果你在java代码中生成按钮可能会很复杂),这是必须的。

@Override
public void onClick(View v) {
    if (v == m_myCards) {
        Intent intent = new Intent(this, MyCards.class);
        this.startActivity(intent);
    }
    else if (v == m_exit) {
        MyAlertDialog();
    }
    else if (v == m_back) {
        finish();            
    }

这项技术的另一个好处是它灵活而快速(无需解析ID)。 不好的是你需要将小部件保留在内存中。

不知道哪种方法更好。


public class MainActivity extends Activity
        implements View.OnClickListener {
    private Button btnForward, btnBackword, btnPause, btnPlay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initControl();
    }

    private void initControl() {
        btnForward = (Button) findViewById(R.id.btnForward);
        btnBackword = (Button) findViewById(R.id.btnBackword);
        btnPause = (Button) findViewById(R.id.btnPause);
        btnPlay = (Button) findViewById(R.id.btnPlay);
        btnForward.setOnClickListener(this);
        btnBackword.setOnClickListener(this);
        btnPause.setOnClickListener(this);
        btnPlay.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnForward:
                break;
            case R.id.btnBackword:
                break;
            case R.id.btnPause:
                break;
            case R.id.btnPlay:
                break;
        }
    }
}

我使用的是自定义视图,我在其他视图上进行了布局,并且只用与背景相同的颜色绘制了4个小角。 这适用于任何视图内容,并且不会分配太多内存。

public class RoundedCornersView extends View {
    private float mRadius;
    private int mColor = Color.WHITE;
    private Paint mPaint;
    private Path mPath;

    public RoundedCornersView(Context context) {
        super(context);
        init();
    }

    public RoundedCornersView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();

        TypedArray a = context.getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.RoundedCornersView,
                0, 0);

        try {
            setRadius(a.getDimension(R.styleable.RoundedCornersView_radius, 0));
            setColor(a.getColor(R.styleable.RoundedCornersView_cornersColor, Color.WHITE));
        } finally {
            a.recycle();
        }
    }

    private void init() {
        setColor(mColor);
        setRadius(mRadius);
    }

    private void setColor(int color) {
        mColor = color;
        mPaint = new Paint();
        mPaint.setColor(mColor);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setAntiAlias(true);

        invalidate();
    }

    private void setRadius(float radius) {
        mRadius = radius;
        RectF r = new RectF(0, 0, 2 * mRadius, 2 * mRadius);
        mPath = new Path();
        mPath.moveTo(0,0);
        mPath.lineTo(0, mRadius);
        mPath.arcTo(r, 180, 90);
        mPath.lineTo(0,0);
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {

        /*Paint paint = new Paint();
        paint.setColor(Color.RED);
        canvas.drawRect(0, 0, mRadius, mRadius, paint);*/

        int w = getWidth();
        int h = getHeight();
        canvas.drawPath(mPath, mPaint);
        canvas.save();
        canvas.translate(w, 0);
        canvas.rotate(90);
        canvas.drawPath(mPath, mPaint);
        canvas.restore();
        canvas.save();
        canvas.translate(w, h);
        canvas.rotate(180);
        canvas.drawPath(mPath, mPaint);
        canvas.restore();
        canvas.translate(0, h);
        canvas.rotate(270);
        canvas.drawPath(mPath, mPaint);
    }
}




android button listener