import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
public void setViewportChangeListener(ViewportChangeListener viewportChangeListener) {
    if (null == viewportChangeListener) {
        this.viewportChangeListener = new DummyVieportChangeListener();
    } else {
        this.viewportChangeListener = viewportChangeListener;
    }
}
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
public void setViewportChangeListener(ViewportChangeListener viewportChangeListener) {
    if (viewportChangeListener == null) {
        this.viewportChangeListener = new DummyVieportChangeListener();
    } else {
        this.viewportChangeListener = viewportChangeListener;
    }
}
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
private void addListener() {
    this.chart.setViewportChangeListener(new ViewportChangeListener() {
        public void onViewportChanged(Viewport viewport) {
            if (viewport.left <= -1.0f && DietChartActivity.this.currentPage <=
                    DietChartActivity.this.totalPage && DietChartActivity.this.canLoad) {
                DietChartActivity.this.getDietRecord();
            }
        }
    });
}
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
private void initListener() {
    this.columnChartView.setViewportChangeListener(new ViewportChangeListener() {
        public void onViewportChanged(Viewport viewport) {
            if (viewport.left <= -1.0f && StepHistoryActivity.this.canload && ((float)
                    StepHistoryActivity.this.stepList.size()) > StepHistoryActivity.PER_PAGE
                    && StepHistoryActivity.this.page < 4) {
                StepHistoryActivity.this.page = StepHistoryActivity.this.page + 1;
                StepHistoryActivity.this.getStepHistory();
            }
        }
    });
}
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
@Override
public void setViewportChangeListener(ViewportChangeListener viewportChangeListener) {
    chartComputator.setViewportChangeListener(viewportChangeListener);
}
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
public void setViewportChangeListener(ViewportChangeListener viewportChangeListener) {
    this.chartComputator.setViewportChangeListener(viewportChangeListener);
}
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
/**
 * Set listener for current viewport changes. It will be called when viewport change either by gesture or
 * programmatically. Note! This method works only for preview charts. It is intentionally disabled for other types
 * of charts to avoid unnecessary method calls during invalidation.
 */
public void setViewportChangeListener(ViewportChangeListener viewportChangeListener);
 

import lecho.lib.hellocharts.listener.ViewportChangeListener; //导入依赖的package包/类
void setViewportChangeListener(ViewportChangeListener viewportChangeListener);