Question

问题是我的应用在尝试添加和删除活动片段时在某些情况下崩溃了。添加和删除片段代码如下：

private void popFragment() {
        //Load animation
        Animation slide_up = AnimationUtils.loadAnimation(getApplicationContext(),
                R.anim.slide_up);
        flBranch.startAnimation(slide_up);
        flBranch.setVisibility(View.VISIBLE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Window window = getWindow();
          window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS|WindowManager.LayoutParams.FLAG_FULLSCREEN);
        }

        Log.d("Tag", "Fragment Transaction Commit");
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.fl_branch, new BranchFragment());
        ft.commit();
}


private void removeFragmentBroadcast() {
        IntentFilter intentFilter = new IntentFilter("REMOVE_FRAGMENT");
        broadcastReceiverTab = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {

                //Branch detail
                BranchModel bm = new Gson().fromJson(intent.getStringExtra("branch_address"), BranchModel.class);

                //Change text
                if (bm != null) {
                    txtBranchAddress.setText(bm.getLocation());
                    txtBranchName.setText(bm.getName());
                }

                //Set new values to offer model
                offerModel.setPhone(bm.getPhone());
                offerModel.setLatitude(bm.getLatitude());
                offerModel.setLongitude(bm.getLongitude());

                //Remove fragment with animation
                Animation slide_down = AnimationUtils.loadAnimation(getApplicationContext(),
                        R.anim.slide_down);
                flBranch.startAnimation(slide_down);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                    Window window = getWindow();
                    window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
                }
                getSupportFragmentManager().beginTransaction().
                        remove(getSupportFragmentManager().findFragmentById(R.id.fl_branch)).commit();
                flBranch.setVisibility(View.GONE);
            }
        };
        context.registerReceiver(broadcastReceiverTab, intentFilter);
}

我还取消了在onDestroy上广播的注册

@Override
    protected void onDestroy() {
        super.onDestroy();
        context.unregisterReceiver(broadcastReceiverTab);
}

这就是我如何将广播发送到有关单击/关闭项目的活动

imgCancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent("REMOVE_FRAGMENT");
                intent.putExtra("branch_address", new Gson().toJson(mList.get(pos)));
                context.sendBroadcast(intent);
            }
        });

以上代码在我的项目中提供了详细信息活动。我直接打开提供房屋报价清单中的详细信息，并尝试打开和关闭分支机构片段工作正常。但是如果我从供应商列表转到供应商详细信息，其中还包含要约列表，然后我要提供详细信息并尝试打开关闭分支片段，我的应用程序崩溃了。进行调试，因为在onReceive中控件将移动到的结束代码 onReceive。崩溃如下：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.Fragment.setNextAnim(int)' on a null object reference
        at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:768)
        at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
        at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:733)
        at android.os.Handler.handleCallback(Handler.java:754)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:163)
        at android.app.ActivityThread.main(ActivityThread.java:6238)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

尝试在空对象引用上调用虚拟方法'void android.support.v4.app.Fragment.setNextAnim（int）'

0 个答案: