自定义控件生成随机数

public class MainActivity extends AppCompatActivity {

    private ToListItemView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (ToListItemView) findViewById(R.id.tv);
        tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Random random=new Random();
                int i = random.nextInt(10000);
                if(i>1000){
                    tv.setText(i+"");

                }else{

                }

            }
        });

    }



}

//自定义类

public class ToListItemView extends TextView {
  
  
  
    public ToListItemView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);  
        // TODO Auto-generated constructor stub  
    }  
    public ToListItemView(Context context, AttributeSet attrs) {
        super(context, attrs);  
        // TODO Auto-generated constructor stub  
    }  
    public ToListItemView(Context context) {
        super(context);  
        // TODO Auto-generated constructor stub  
    }  
    @Override  
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub  
        Paint mPaint1 = new Paint();
        mPaint1.setColor(getResources().getColor(android.R.color.holo_blue_light));  
        mPaint1.setStyle(Paint.Style.FILL);  
        Paint mPaint2 = new Paint();  
        mPaint2.setColor(Color.YELLOW);
        mPaint2.setStyle(Paint.Style.FILL);  
        //绘制外层矩形  
        canvas.drawRect(0, 0, getMeasuredWidth(),getMeasuredHeight(), mPaint1);  
        //绘制内层矩形  
        canvas.drawRect(10, 10, getMeasuredWidth()-10, getMeasuredHeight()-10, mPaint2);  
        canvas.save();  
        //绘制文字前平移10像素  
        canvas.translate(10, 0);  
        super.onDraw(canvas);  
        canvas.restore();  
    }  
  
}

//布局

<com.bawei.ceshi.ToListItemView
       android:layout_width="100dp"
       android:layout_height="100dp"
       android:id="@+id/tv"
       android:textColor="#f00"
       android:background="#ff0"
       android:text="1202"
       />