Android 在Fragment中的TextView长按弹出对话框（长按监听事件）

今天药忘吃喽~ 2022-12-19 06:23 174阅读 0赞

# 第一步，获取操作句柄 #

textview控件名称叫showhistory.

设置它可以滚动。

//获得操作句柄
    outputdata=(TextView)getActivity().findViewById(R.id.showhistory);
    outputdata.setMovementMethod(ScrollingMovementMethod.getInstance());

# 第二步，添加长按监听事件 #

//长按事件响应
    outputdata.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
           //在此写响应事件
            return false;
        }
    });

# 第三步，添加弹出对话框 #

//长按事件响应
    outputdata.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
    
            //定义AlertDialog.Builder对象，当长按列表项的时候弹出确认删除对话框
            AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
            builder.setMessage("确定删除?");
            builder.setTitle("提示");
    
            //添加AlertDialog.Builder对象的setPositiveButton()方法
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    File Folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "data");
                    if (!Folder.exists())
                    {
                        System.out.println(Folder.getPath());
                    }else {
                        String sdCardDir = Environment.getExternalStorageDirectory().getAbsolutePath();
                        String historyFile=sdCardDir+"/data/history.txt";
                        File saveFile = new File(sdCardDir+"/data/", "history.txt");
    
                        saveFile.delete();
                        outputdata.setText("");
                    }
                    Toast.makeText(getActivity(), "删除列表项", Toast.LENGTH_SHORT).show();
                }
            });
    
            builder.setCancelable(true);   //设置按钮是否可以按返回键取消,false则不可以取消
            AlertDialog dialog = builder.create();  //创建对话框
            dialog.setCanceledOnTouchOutside(true);      //设置弹出框失去焦点是否隐藏,即点击屏蔽其它地方是否隐藏
            dialog.show();
            return false;
        }
    });

# 完整代码如下： #

//获得操作句柄
    outputdata=(TextView)getActivity().findViewById(R.id.showhistory);
    outputdata.setMovementMethod(ScrollingMovementMethod.getInstance());
    
    //长按事件响应
    outputdata.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
    
            //定义AlertDialog.Builder对象，当长按列表项的时候弹出确认删除对话框
            AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
            builder.setMessage("确定删除?");
            builder.setTitle("提示");
    
            //添加AlertDialog.Builder对象的setPositiveButton()方法
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    File Folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "data");
                    if (!Folder.exists())
                    {
                        System.out.println(Folder.getPath());
    //                            DocumentsUtils.mkdirs(getContext(),Folder);
    //                Folder.mkdir();//创建文件夹
                    }else {
                        String sdCardDir = Environment.getExternalStorageDirectory().getAbsolutePath();
                        String historyFile=sdCardDir+"/data/history.txt";
                        File saveFile = new File(sdCardDir+"/data/", "history.txt");
    
                        saveFile.delete();
                        outputdata.setText("");
                    }
                    Toast.makeText(getActivity(), "删除列表项", Toast.LENGTH_SHORT).show();
                }
            });
    
            builder.setCancelable(true);   //设置按钮是否可以按返回键取消,false则不可以取消
            AlertDialog dialog = builder.create();  //创建对话框
            dialog.setCanceledOnTouchOutside(true);      //设置弹出框失去焦点是否隐藏,即点击屏蔽其它地方是否隐藏
            dialog.show();
            return false;
        }
    });