在android

Question

我想在我的android项目中使用progressbar，用户可以选择多个文件上传到服务器。

我想显示每个文件上传进度的进度条。我不想使用ProgressDialog来完成这项任务。我打算在recyclerview中显示所有选定的文件上传进度（连续的每个进度条），以便用户滚动浏览所有进度条。

我没有找到任何好的教程。我一直在使用recyclerview，但是整齐地放置一个进度条在这里很重要。有什么建议吗？

Answer 1

您只需在recycler_item.xml上设置ProgressBar（将recycler_item替换为您的实际项目文件名），该Adapter将在自定义ProgressBar上充气。

每次调用VISIBLE时，将onBindViewHolder()的可见性设置为class ProgressBarAdapter extends RecyclerView.Adapter<ProgressBarAdapter.ViewHolder>{ public class ViewHolder extends RecyclerView.ViewHolder{ public TextView textView; public ProgressBar progressBar; public ViewHolder(View itemView){ super(itemView); textView = (TextView) itemView.findViewById(R.id.text1); progressBar = (ProgressBar) itemView.findViewById(R.id.progress1); } } private List<String> mFiles; private Context mContext; public ProgressBarAdapter(List<String> files){ mFiles = files; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { mContext = parent.getContext(); LayoutInflater inflater = LayoutInflater.from(mContext); View viewInflated = inflater.inflate(R.layout.recycler_item, parent, false); return new ViewHolder(viewInflated); } @Override public void onBindViewHolder(ViewHolder holder, int position) { String file = mFiles.get(position); TextView textView = holder.textView; textView.setText(file); holder.progressBar.setVisibility(View.VISIBLE); holder.progressBar.setIndeterminate(true); } @Override public int getItemCount() { return mFiles.size(); } } 。

快速举例：

ProgressBarAdapter.java （真正的神奇之处）。

public class MainActivity extends AppCompatActivity {

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

        ArrayList<String> files = new ArrayList<>();
        files.add("File 1");
        files.add("File 2");
        files.add("File 3");

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler1);
        recyclerView.setAdapter(new ProgressBarAdapter(files));
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }
}

<强> MainActivity.java

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </android.support.v7.widget.RecyclerView>

</LinearLayout>

<强> activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <!-- This ProgressBar will get inflated for each ReyclerView item -->
    <ProgressBar 
        android:id="@+id/progress1"
        android:visibility="gone"
        style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

<强> recycler_item.xml

<expression-component doc:name="Expression">
  <![CDATA[
    String input = payload.replaceAll("=", ":");
    input = input.replaceAll(",$", "");

    payload = new org.json.JSONArray("[" + input + "]");]]>
</expression-component>

结果：