android 开发 在一个工具类(或者适配器class)里启动activity

实现思路：

1.需要给工具类里传入context；

2.使用上下文mContext.startActivity启动activity

例子1：

public class SafePlaceRecyclerViewAdapter  {
    private Context mContext;
	public SafePlaceRecyclerViewAdapter(Context context){
        mContext = context;
    }

	public void start(){
	 Intent intent = new Intent(mContext,SafeAreaInformation.class);
	 mContext.startActivity(intent);
	}

}

例子2：

public class SafePlaceRecyclerViewAdapter extends RecyclerView.Adapter<SafePlaceRecyclerViewAdapter.ViewHolder> {
    private List <SafePlaceData> mList;
    private Context mContext;
    public SafePlaceRecyclerViewAdapter(Context context, List<SafePlaceData> list){
        this.mList = list;
        mContext = context;
    }
    @Override
    public ViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.safe_place_row_layout,parent,false);
        ViewHolder viewHolder = new ViewHolder(view);
        viewHolder.safePlaceRowLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               Intent intent = new Intent(v.getContext(),SafeAreaInformation.class);
                mContext.startActivity(intent);

            }
        });
        return viewHolder;
    }