如何在Android Studio中全局设置AlterDialog

问题描述

我使用this解决方案，试图使用“ AlterDialog”显示一个加载框。

public void setProgressDialogRelayResponse() {

    int llPadding = 30;
    LinearLayout ll = new LinearLayout(mContext);
    ll.setOrientation(LinearLayout.HORIZONTAL);
    ll.setPadding(llPadding,llPadding,llPadding);
    ll.setGravity(Gravity.CENTER);
    LinearLayout.LayoutParams llParam = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
    llParam.gravity = Gravity.CENTER;
    ll.setLayoutParams(llParam);

    ProgressBar progressBar = new ProgressBar(mContext);
    progressBar.setIndeterminate(true);
    progressBar.setPadding(0,0);
    progressBar.setLayoutParams(llParam);

    llParam = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
    llParam.gravity = Gravity.CENTER;
    TextView tvText = new TextView(mContext);
    tvText.setText("Status Verification.....");
    tvText.setTextColor(Color.RED);
    tvText.setTextSize(20);
    tvText.setLayoutParams(llParam);

    ll.addView(progressBar);
    ll.addView(tvText);

    AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
    builder.setCancelable(true);
    builder.setView(ll);

     AlertDialog dialog = builder.create();
    dialog.show();
     dialog.setCancelable(false);
    Window window = dialog.getWindow();
    if (window != null) {
        WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
        layoutParams.copyFrom(dialog.getWindow().getAttributes());
        layoutParams.width = LinearLayout.LayoutParams.WRAP_CONTENT;
        layoutParams.height = LinearLayout.LayoutParams.WRAP_CONTENT;
        dialog.getWindow().setAttributes(layoutParams);
    }
}

它正在显示，但一直在显示。我想在执行某种方法时将其关闭。为此，我要全局设置AlteDialog。我尝试了以下

public class NewFormFragment extends Fragment {
public AlertDialog dialog = new AlertDialog(); }

它给了我error: no suitable constructor found for AlertDialog(no arguments)

然后我尝试了以下

 public AlertDialog dialog = new AlertDialog(getActivity());

哪个给我下面的错误

错误：找不到适用于AlertDialog（Activity）的合适的构造函数

然后我执行以下操作

error: no suitable constructor found for AlertDialog(Context) 

提供：Context mContext;

它也给我同样的错误

错误：找不到适用于AlertDialog（Context）的合适构造函数

最后我尝试了以下

AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
public AlertDialog dialog = builder.create();

但是这一次，我的app在login screen之后崩溃，并出现以下错误。

  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.thumbsol.accuratemobileassetsmanagament/com.thumbsol.accuratemobileassetsmanagament.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources$Theme android.content.Context.getTheme()' on a null object reference
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:201)
    at android.app.ActivityThread.main(ActivityThread.java:6810)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources$Theme android.content.Context.getTheme()' on a null object reference
    at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:224)
    at android.app.AlertDialog$Builder.<init>(AlertDialog.java:465)
    at com.thumbsol.accuratemobileassetsmanagament.fragment.NewFormFragment.<init>(NewFormFragment.java:339)
    at com.thumbsol.accuratemobileassetsmanagament.MainActivity.onCreate(MainActivity.java:76)
    at android.app.Activity.performCreate(Activity.java:7224)
    at android.app.Activity.performCreate(Activity.java:7213)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081) 
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:201) 
    at android.app.ActivityThread.main(ActivityThread.java:6810) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)

(NewFormFragment.java:339) is hitting at `AlertDialog.Builder builder = new AlertDialog.Builder(mContext);`

任何帮助将不胜感激

解决方法

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