如何在ProgressDialog中轻松将进度指示器居中(当没有标题/文本传递时)

我做了一些测试,我觉得实现这一点的最佳方法是定制 Dialog .

下面是我所做的一个例子。这将回答问题2,但会让您了解如何解决问题1。

public class MyProgressDialog extends Dialog {

    public static MyProgressDialog show(Context context, CharSequence title,
            CharSequence message) {
        return show(context, title, message, false);
    }

    public static MyProgressDialog show(Context context, CharSequence title,
            CharSequence message, boolean indeterminate) {
        return show(context, title, message, indeterminate, false, null);
    }

    public static MyProgressDialog show(Context context, CharSequence title,
            CharSequence message, boolean indeterminate, boolean cancelable) {
        return show(context, title, message, indeterminate, cancelable, null);
    }

    public static MyProgressDialog show(Context context, CharSequence title,
            CharSequence message, boolean indeterminate,
            boolean cancelable, OnCancelListener cancelListener) {
        MyProgressDialog dialog = new MyProgressDialog(context);
        dialog.setTitle(title);
        dialog.setCancelable(cancelable);
        dialog.setOnCancelListener(cancelListener);
        /* The next line will add the ProgressBar to the dialog. */
        dialog.addContentView(new ProgressBar(context), new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        dialog.show();

        return dialog;
    }

    public MyProgressDialog(Context context) {
        super(context, R.style.NewDialog);
    }
}

所有静态方法都来自 this 链接,没有什么奇怪的,但是神奇发生在构造函数中。 检查是否将样式作为参数传递。该样式如下:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="NewDialog" parent="@android:Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowTitleStyle">@null</item>
        <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
        <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
        <item name="android:backgroundDimEnabled">false</item>
        <item name="android:background">@android:color/transparent</item>
    </style>
</resources>

结果是 ProgressBar 在屏幕中心旋转。没有 backgroundDim 而没有 对话 盒子。

简单且可定制的方式:

定义动画: (res/drawable/loader-anim.xml)

<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/image_for_rotation"
android:pivotX="50%"
android:pivotY="50%" />

或:

<animation-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:drawable="@drawable/img_loader_frame1"
android:duration="150"/>
...
<item
android:drawable="@drawable/img_loader_frame2"
android:duration="150"/>
...
</animation-list>

然后,定义布局: (res/layout/loader.xml)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_gravity="center_vertical|center_horizontal"> 
<ProgressBar
android:layout_width="200dp"
android:layout_height="200dp"
android:indeterminateDrawable="@drawable/loader_anim" />
</LinearLayout>

然后,实例进度对话框:

ProgressDialog dialog;
...
dialog = ProgressDialog.show(this,null,null);
dialog.setContentView(R.layout.loader);
...
process();
...
dialog.dismiss();

更多信息:

我使用下面的,它不需要布局文件,并在屏幕中间放置一个居中的、无边界的阻塞进度条。

private ProgressDialog progressDialog;


setUIToWait(true);

...long process...

setUIToWait(false);


private void setUIToWait(boolean wait) {

    if (wait) {
        progressDialog=ProgressDialog.show(this,null,null);
        progressDialog.setContentView(new ProgressBar(this));
    } else {
        progressDialog.dismiss();
    }

}

如果只想显示不确定的进度条。

ProgressDialog progressDialog = ProgressDialog.show(this, null, null, true, false);
progressDialog.setContentView(R.layout.progress_layout);

并创建一个名为“progress-layout.xml”的布局XML文件

<?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" >

    <ProgressBar
        android:id="@+id/progressBar1"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

</LinearLayout>

只需按以下方法完成

在res->values->样式中添加以下代码

<style name="MyGravity" parent="android:Theme.Material.Dialog" ></style>

然后创建您的ProgressDialog,如下所述

ProgressDialog dialog = new ProgressDialog(ctx, R.style.MyGravity);
dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);

//create Dialog by using below method

@Override
protected Dialog onCreateDialog(int id) {

    switch (id) {

    case DIALOG1_KEY: {
        Dialog dialog = new Dialog(this,R.style.NewDialog);
        dialog.setContentView(R.layout.progress);
        dialog.setCancelable(true);
        return dialog;
    }
    }
    return null;
}

//then in your onCreate () you can call like below

@Override

public void onCreate(Bundle savedInstatncestate)

{

final Handler mHandler = new Handler();
showDialog(DIALOG1_KEY);
new Thread() {
public void run() {
try {
    sleep(3000);
    Runnable r = new Runnable() 
    {
    public void run() 
    {
               //do your background process

             dismissDialog(DIALOG1_KEY);
    }

        };
mHandler.post(r);
     } catch (Exception e) {
     }
   }
}.start();
}

您可以在所有活动中添加一个ProgressBar,以便在其中显示居中的ProgressDialog。在acitivity.xml中使用以下内容:

<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content" 
android:id="@+id/progressBar"
android:layout_centerInParent="true"
android:visibility="gone"/>

在acitivity.java中,使用

ProgressBar bar = new Progress();
bar = (ProgressBar) findViewById(R.id.progressBar);

现在,当您想要显示进度条时,只需将其可见性设置为可见,而取消时,将可见性设置为不可见。

bar.setVisibility(View.VISIBLE);
bar.setVisibility(View.GONE);

使用ProgressBar并将其添加到LinearLayout在我的示例中的效果如下:

progressbar mspinner=new progressbar(this);
mspinner.setlayoutParams(新的layoutParams(layoutParams.wrap_content,layoutParams.wrap_content));
mspinner.backgroundresource(r.drawable.loading_1);
mspinner.setInterminate(真);
< /代码> 


:


ProgressBar mSpinner = new ProgressBar(this); 
mSpinner.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mSpinner.setBackgroundResource(R.drawable.loading_1);
mSpinner.setIndeterminate(true);