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  • 实现购物车那种加减效果

    public class MainActivity extends AppCompatActivity {
    private ImageView img1, img2;
    private TextView tv1;
    private int mNumber = 0;
    private int mMaxNumber = 99;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    img1 = (ImageView) findViewById(R.id.iv1);
    img2 = (ImageView) findViewById(R.id.iv2);
    tv1 = (TextView) findViewById(R.id.tv);
    img1.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    if (mNumber > 0) {
    mNumber--;
    }
    setNumberText(mNumber + "");
    }
    });
    img2.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    if (mNumber < mMaxNumber) {
    mNumber++;
    }
    setNumberText(mNumber + "");
    }
    });
    
    }
    
    private void setNumberText(String s) {
    tv1.setText(s);
    mNumber = Integer.valueOf(s);
    if (mAddAndSubtractOnClickListener != null) {
    mAddAndSubtractOnClickListener.numberChange(mNumber);
    }
    
    }
    
    private AddAndSubtractOnClickListener mAddAndSubtractOnClickListener;
    
    public void setAddAndSubtractOnClickListener(AddAndSubtractOnClickListener addAndSubtractOnClickListener) {
    mAddAndSubtractOnClickListener = addAndSubtractOnClickListener;
    }
    
    /**
    * 加减按钮回调接口
    */
    public interface AddAndSubtractOnClickListener {
    void numberChange(int num);
    }
    
    }
    

      

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  • 原文地址:https://www.cnblogs.com/pppp2/p/5753419.html
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