Android實現SwipeRefreshLayout首次進入自動刷新

看到了Android版知乎實現了這種效果，就自己也實現了一下。

先來一張效果圖

實現方式：

方法一：

①在onWindowFocusChanged()方法中，設置為刷新狀態為true

@Override
  public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    mSwipeRefreshLayout.setRefreshing(true);
  }

②在獲取數據完成後設置刷新狀態為false

if (mSwipeRefreshLayout.isRefreshing()) {
              mSwipeRefreshLayout.setRefreshing(false);
            }

方法二：

①調用mSwipeRefreshLayout.measure()方法後，設置刷新狀態為true

//手動調用,通知系統去測量
    mSwipeRefreshLayout.measure(0,0);
    mSwipeRefreshLayout.setRefreshing(true);

②在獲取數據完成後設置刷新狀態為false

if (mSwipeRefreshLayout.isRefreshing()) {
              mSwipeRefreshLayout.setRefreshing(false);
            }

說明：
方法一和方法二的第一步的目的，都是為了在SwipeRefreshLayout繪制完成之後，再設置刷新狀態為true，否則大多數情況下，SwipeRefreshLayout刷新球會不顯示。

源碼：

package org.raphets.swiperefreshlayoutdemo;

import android.graphics.Color;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
  private SwipeRefreshLayout mSwipeRefreshLayout;
  private TextView mTextView;

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

    mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.srl);
    mTextView = (TextView) findViewById(R.id.tv);


    //設置刷新球顏色
    mSwipeRefreshLayout.setColorSchemeColors(Color.BLUE, Color.RED, Color.YELLOW);
    mSwipeRefreshLayout.setProgressBackgroundColorSchemeColor(Color.parseColor("#BBFFFF"));
    //手動調用,通知系統去測量
//    mSwipeRefreshLayout.measure(0,0);
    mSwipeRefreshLayout.setRefreshing(true);
    getData();
  }

  /**
   * 模擬網絡請求
   */
  private void getData() {
    new Thread() {
      @Override
      public void run() {
        super.run();
        //模擬網絡請求
        try {
          Thread.sleep(3000);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
        //在UI線程中更新UI
        runOnUiThread(new Runnable() {
          @Override
          public void run() {
            mTextView.setText("首次進入自動刷新");
            if (mSwipeRefreshLayout.isRefreshing()) {
              mSwipeRefreshLayout.setRefreshing(false);
            }
          }
        });
      }
    }.start();
  }

  @Override
  public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    mSwipeRefreshLayout.setRefreshing(true);
  }
}

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