Toast.getView() returns 在 Android 11 (API 30) 上为空
Toast.getView() returns null on Android 11 (API 30)
我刚刚在模拟器中安装了 Android R (API 30) 图像来试用我的应用程序，但在尝试设置 Toast 的背景颜色时它崩溃了。
Toast toast = Toast.makeText(ctxt, msg, duration);
View view = toast.getView();
view.setBackgroundColor(0xFF303030);
TextView tview = view.findViewById(android.R.id.message);
tview.setTextColor(Color.WHITE);
toast.show();
这真的很奇怪，因为 Android Q (API 29) 工作得很好。
我的 build.gradle 更新为 Android R (API 30)
compileSdkVersion 30
buildToolsVersion "30.0.1"
有新的方法吗？？
自 Android 11 起，根据 Google“保护用户”，自定义 toasts/toast 修改已弃用。因此，为什么您在 Android 30 中的应用无法显示自定义祝酒词。
来自 Android 开发者文档：
Custom toast views are deprecated. Apps can create a standard text toast with the makeText(android.content.Context, java.lang.CharSequence, int)
我发现从 API 30 开始显示自定义 toast 的唯一方法是临时创建它们。
XML 布局
根据需要自定义
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".main_activity">
<!--Ad hoc toast Textview-->
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_margin="18dp"
android:background="@drawable/ad_hoc_toast_background"
android:textColor="#1e1e1e"
android:gravity="center"
android:visibility="gone"
android:layout_alignParentBottom="true"
android:id="@+id/ad_hoc_toast_textview"
tools:text="Temporary message bla bla bla ..."/>
</RelativeLayout>
吐司背景 (ad_hoc_toast_background.xml)
根据需要自定义
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size
android:width="220dp"
android:height="100dp"/>
<corners
android:radius="25dp"
/>
<solid
android:color="#e6ffffff"
/>
</shape>
</item>
</selector>
定义show_ad_hoc_toast()方法
private void show_ad_hoc_toast(final TextView ad_hoc_toast_textview, String text){
//Set the text
ad_hoc_toast_textview.setText(text);
//Create alpha animation
AlphaAnimation animation1 = new AlphaAnimation(0f, 1f);
//Set duration
animation1.setDuration(300);
//Set that the animation changes persist once the animation finishes
animation1.setFillAfter(true);
//Set on AnimationEnd Listner
animation1.setAnimationListener(new Animation.AnimationListener() {
@Override public void onAnimationStart(Animation animation){}
@Override public void onAnimationRepeat(Animation animation){}
@Override public void onAnimationEnd(Animation animation){
//After 2250 millis -> hide the toast
new CountDownTimer(2250, 1) {
public void onTick(long millisUntilFinished){}
public void onFinish() {hide_ad_hoc_toast(ad_hoc_toast_textview);}
}.start();
}
});
//Make the view visible
ad_hoc_toast_textview.setVisibility(View.VISIBLE);
//Start animation
ad_hoc_toast_textview.startAnimation(animation1);
}
定义hide_ad_hoc_toast()方法
private void hide_ad_hoc_toast(final TextView ad_hoc_toast_textview){
//Create alpha animation
AlphaAnimation animation1 = new AlphaAnimation(1f, 0f);
//Set duration
animation1.setDuration(300);
//Set that the animation changes persist once the animation finishes
animation1.setFillAfter(true);
//Set on AnimationEnd Listner
animation1.setAnimationListener(new Animation.AnimationListener() {
@Override public void onAnimationStart(Animation animation) { }
@Override public void onAnimationRepeat(Animation animation) { }
@Override public void onAnimationEnd(Animation animation) {
//Make the view gone
ad_hoc_toast_textview.setVisibility(View.GONE);
}
});
//Start animation
ad_hoc_toast_textview.startAnimation(animation1);
}
需要时从代码中调用方法
//Find ad_hoc_toast textview
TextView ad_hoc_toast_textview = findViewById(R.id.ad_hoc_toast_textview);
//Define the text to be shown
String text = "This is the custom toast message"
//Show the ad_hoc toast
show_ad_hoc_toast(ad_hoc_toast_textview, text);
结果
自定义toast之前可以查看
Toast toast = Toast.makeText(ctxt, msg, duration);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
View view = toast.getView();
view.setBackgroundColor(0xFF303030);
TextView tview = view.findViewById(android.R.id.message);
tview.setTextColor(Color.WHITE);
}
toast.show();
在 Toast 上设置自定义 view 的解决方案已弃用 API 级别 30
文档说
This method was deprecated in API level 30. Custom toast views are
deprecated. Apps can create a standard text toast with the
makeText(android.content.Context, java.lang.CharSequence, int) method,
or use a Snackbar when in the foreground. Starting from Android
Build.VERSION_CODES#R, apps targeting API level Build.VERSION_CODES#R
or higher that are in the background will not have custom toast views
displayed.
有一个解决方法仍然有效并且没有被弃用
Toast.makeText(applicationContext,
HtmlCompat.fromHtml("<font color='red'>custom toast message</font>", HtmlCompat.FROM_HTML_MODE_LEGACY),
Toast.LENGTH_LONG).show()
Html色标也可以是<font color='#ff6347'>
@pvalle & @Aayush Panda，它适用于我 Android 11。请检查下面的代码
public static void showCenterToastMessage(Context context, String msg) {
LayoutInflater inflater = LayoutInflater.from(context);
View layout = inflater.inflate(R.layout.custom_toast,null);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText(msg);
text.setPadding(20,0,20,0);
text.setTextSize(18);
text.setTextColor(Color.WHITE);
Toast toast = new Toast(context);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
layout.setBackgroundColor(Color.DKGRAY);
toast.setView(layout);
toast.show();
}
我刚刚在模拟器中安装了 Android R (API 30) 图像来试用我的应用程序，但在尝试设置 Toast 的背景颜色时它崩溃了。
Toast toast = Toast.makeText(ctxt, msg, duration);
View view = toast.getView();
view.setBackgroundColor(0xFF303030);
TextView tview = view.findViewById(android.R.id.message);
tview.setTextColor(Color.WHITE);
toast.show();
这真的很奇怪，因为 Android Q (API 29) 工作得很好。
我的 build.gradle 更新为 Android R (API 30)
compileSdkVersion 30
buildToolsVersion "30.0.1"
有新的方法吗？？
自 Android 11 起，根据 Google“保护用户”，自定义 toasts/toast 修改已弃用。因此，为什么您在 Android 30 中的应用无法显示自定义祝酒词。
来自 Android 开发者文档：
Custom toast views are deprecated. Apps can create a standard text toast with the makeText(android.content.Context, java.lang.CharSequence, int)
我发现从 API 30 开始显示自定义 toast 的唯一方法是临时创建它们。
XML 布局
根据需要自定义
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".main_activity">
<!--Ad hoc toast Textview-->
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:layout_margin="18dp"
android:background="@drawable/ad_hoc_toast_background"
android:textColor="#1e1e1e"
android:gravity="center"
android:visibility="gone"
android:layout_alignParentBottom="true"
android:id="@+id/ad_hoc_toast_textview"
tools:text="Temporary message bla bla bla ..."/>
</RelativeLayout>
吐司背景 (ad_hoc_toast_background.xml)
根据需要自定义
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size
android:width="220dp"
android:height="100dp"/>
<corners
android:radius="25dp"
/>
<solid
android:color="#e6ffffff"
/>
</shape>
</item>
</selector>
定义show_ad_hoc_toast()方法
private void show_ad_hoc_toast(final TextView ad_hoc_toast_textview, String text){
//Set the text
ad_hoc_toast_textview.setText(text);
//Create alpha animation
AlphaAnimation animation1 = new AlphaAnimation(0f, 1f);
//Set duration
animation1.setDuration(300);
//Set that the animation changes persist once the animation finishes
animation1.setFillAfter(true);
//Set on AnimationEnd Listner
animation1.setAnimationListener(new Animation.AnimationListener() {
@Override public void onAnimationStart(Animation animation){}
@Override public void onAnimationRepeat(Animation animation){}
@Override public void onAnimationEnd(Animation animation){
//After 2250 millis -> hide the toast
new CountDownTimer(2250, 1) {
public void onTick(long millisUntilFinished){}
public void onFinish() {hide_ad_hoc_toast(ad_hoc_toast_textview);}
}.start();
}
});
//Make the view visible
ad_hoc_toast_textview.setVisibility(View.VISIBLE);
//Start animation
ad_hoc_toast_textview.startAnimation(animation1);
}
定义hide_ad_hoc_toast()方法
private void hide_ad_hoc_toast(final TextView ad_hoc_toast_textview){
//Create alpha animation
AlphaAnimation animation1 = new AlphaAnimation(1f, 0f);
//Set duration
animation1.setDuration(300);
//Set that the animation changes persist once the animation finishes
animation1.setFillAfter(true);
//Set on AnimationEnd Listner
animation1.setAnimationListener(new Animation.AnimationListener() {
@Override public void onAnimationStart(Animation animation) { }
@Override public void onAnimationRepeat(Animation animation) { }
@Override public void onAnimationEnd(Animation animation) {
//Make the view gone
ad_hoc_toast_textview.setVisibility(View.GONE);
}
});
//Start animation
ad_hoc_toast_textview.startAnimation(animation1);
}
需要时从代码中调用方法
//Find ad_hoc_toast textview
TextView ad_hoc_toast_textview = findViewById(R.id.ad_hoc_toast_textview);
//Define the text to be shown
String text = "This is the custom toast message"
//Show the ad_hoc toast
show_ad_hoc_toast(ad_hoc_toast_textview, text);
结果
自定义toast之前可以查看
Toast toast = Toast.makeText(ctxt, msg, duration);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
View view = toast.getView();
view.setBackgroundColor(0xFF303030);
TextView tview = view.findViewById(android.R.id.message);
tview.setTextColor(Color.WHITE);
}
toast.show();
在 Toast 上设置自定义 view 的解决方案已弃用 API 级别 30
文档说
This method was deprecated in API level 30. Custom toast views are deprecated. Apps can create a standard text toast with the makeText(android.content.Context, java.lang.CharSequence, int) method, or use a Snackbar when in the foreground. Starting from Android Build.VERSION_CODES#R, apps targeting API level Build.VERSION_CODES#R or higher that are in the background will not have custom toast views displayed.
有一个解决方法仍然有效并且没有被弃用
Toast.makeText(applicationContext,
HtmlCompat.fromHtml("<font color='red'>custom toast message</font>", HtmlCompat.FROM_HTML_MODE_LEGACY),
Toast.LENGTH_LONG).show()
Html色标也可以是<font color='#ff6347'>
@pvalle & @Aayush Panda，它适用于我 Android 11。请检查下面的代码
public static void showCenterToastMessage(Context context, String msg) {
LayoutInflater inflater = LayoutInflater.from(context);
View layout = inflater.inflate(R.layout.custom_toast,null);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText(msg);
text.setPadding(20,0,20,0);
text.setTextSize(18);
text.setTextColor(Color.WHITE);
Toast toast = new Toast(context);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
layout.setBackgroundColor(Color.DKGRAY);
toast.setView(layout);
toast.show();
}