我已經研究這個問題好幾個小時了。我很確定我正確地將值 saveLeagueId 分配給了 TextView。我想要做的是將一個值從 MainActivity 傳遞到 BowlerActivity。這是我的代碼，它使用意圖傳遞值；@Override public void onClick(View view, final int position) { int leagueId = leaguesList.get(position).getId(); String savedLeagueId = String.valueOf( leagueId ); Intent myIntent = new Intent(MainActivity.this, BowlerActivity.class); Log.d("Passing League Id ", "Passed Value is " + leagueId); myIntent.putExtra("leagueId", savedLeagueId); startActivity(myIntent); overridePendingTransition(0, 0); }我可以看到它實際上是將值傳遞給 BowlerActivity2019-07-09 20:47:06.694 8596-8596/ca.vogl.r.tenpinbowlingcompanion D/Passing League Id: Passed Value is 22019-07-09 20:47:06.777 8596-8596/ca.vogl.r.tenpinbowlingcompanion D/GETALLBOWLERS-SQL: SQL used = >>>>SELECT * FROM bowlers WHERE league_id = 'null' ORDER BY timestamp DESC<<<<2019-07-09 20:47:06.785 8596-8596/ca.vogl.r.tenpinbowlingcompanion D/GETALLBOWLERS-CNT: Number of rows retrieved = 02019-07-09 20:47:06.786 8596-8596/ca.vogl.r.tenpinbowlingcompanion D/GETALLBOWLERS-CNT: Number of elements in bowlerslist = 02019-07-09 20:47:06.786 8596-8596/ca.vogl.r.tenpinbowlingcompanion D/SAVEDLEAGUEID --->: 2但是，當我嘗試將值傳遞給名為 leagueId 的 TextView 時，它為空。
2 回答
MM們
TA貢獻1886條經驗 獲得超2個贊
正如我注意到的，您的 Dialog 窗口中有leagueIdtextView。因此，請確保您的布局文件tvLeagueId中有一個帶有 id的 textView activity_bowlers_dialog。
然后在你的openDialog函數中使用view.findViewById引用 textview
public void openDialog(final boolean shouldUpdate, final Bowler bowler, final int position) {
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(getApplicationContext());
View view = View.inflate(this, R.layout.activity_bowlers_dialog, null);
leagueId = view.findViewById(R.id.tvLeagueId); // <-- Add this line
AlertDialog.Builder alertDialogBuilderUserInput = new AlertDialog.Builder(BowlerActivity.this);
alertDialogBuilderUserInput.setView(view);
leagueId.setText(savedLeagueId);
final EditText inputBowler = view.findViewById(R.id.etBowlerName);
// rest of the code
慕田峪7331174
TA貢獻1828條經驗 獲得超13個贊
它與如何從返回 null 的 findViewById 中獲取 TextView 的意圖沒有任何問題。
java.lang.NullPointerException：嘗試在* 空對象引用上調用虛擬方法“void android.widget.TextView.setText(java.lang.CharSequence)” *
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