SwipeBackActivity.java

package com.yaoyumeng.v2ex.ui.swipeback;

import android.os.Bundle;
import android.view.KeyEvent;
import android.view.MenuItem;
import android.view.View;

import com.yaoyumeng.v2ex.R;
import com.yaoyumeng.v2ex.ui.BaseActivity;

public class SwipeBackActivity extends BaseActivity {
    private SwipeBackActivityHelper mHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mHelper = new SwipeBackActivityHelper(this);
        mHelper.onActivityCreate();

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);
        overridePendingTransition(R.anim.swipeback_stack_right_in,
               R.anim.swipeback_stack_to_back);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mHelper.onPostCreate();
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK){
            onBackPressed();
            return true;
        }else{
            return super.onKeyUp(keyCode, event);
        }
    }

    @Override
    public View findViewById(int id) {
        View v = super.findViewById(id);
        if (v == null && mHelper != null)
            return mHelper.findViewById(id);
        return v;
    }

    public SwipeBackLayout getSwipeBackLayout() {
        return mHelper.getSwipeBackLayout();
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
        overridePendingTransition(R.anim.swipeback_stack_to_front,
                R.anim.swipeback_stack_right_out);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            onBackPressed();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void setSwipeBackEnable(boolean enable) {
        getSwipeBackLayout().setEnableGesture(enable);
    }
}