在特定時間段后如何顯示活動

Question

我有2個活動（FirstActivity和SecondAcitivity）FirstActivity內容EditText和Button我想在用戶單擊按鈕時銷毀firstActivity，並在EditText中輸入時間后啟動SecondActivity

Answer 1

使用CountDownTimer：

String text = editText.getText().toString();
int time = Integer.parseInt(text);//in seconds
time = time * 1000;

new CountDownTimer(time, 1000) {
    public void onTick(long millisUntilFinished) {
    }
    public void onFinish() {
         Intent i = new Intent(this, SecondActivity.class);
         startActivity(i);
    }
}.start();

將其放在onClick中，因此實現View.OnClickListener並添加以下代碼：

public void onClick(View view) {
    if (view.getId() == R.id.button1) {
        //countdown code
    }
}

Answer 2

在onCreate中

Button myBtn = (Button)findViewById(R.id.YourBtnId);
final EditText myEditText = (EditText)findViewById(R.id.YourEditTextId);
myBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        int time = Integer.parseInt(myEditText.getText().toString());
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent startActivity = new Intent(FirstActivity.this, SecondAcitivity.class);
                startActivity(startActivity);
                finish();
            }
        }, time * 1000);
    }
});

Answer 3

我猜您還參加了一項主要活動或家庭活動？ 如果是這樣，您可以執行以下操作以獲得所需的結果：

在您的firstactivity onCreate（）方法中：

Button mButton = (Button)findViewById(R.id.TestButton);
    final EditText mEditText = (EditText)findViewById(R.id.TestTextBox);
    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int time = Integer.parseInt(mEditText.getText().toString());
            Intent intent = new Intent(getApplicationContext(), MainActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            intent.putExtra("Time", time);
            startActivity(intent);
        }
    });

比在您的mainactivity的onCreate（）方法中放置以下內容：

if (getIntent().getIntExtra("Time", 0) > 0) {
        int time = getIntent().getIntExtra("Time" , 0);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(intent);
                finish();
            }
        }, time * 1000);
    }

編輯：（如果您沒有MainActivity）

第一：在XML中注冊接收者

<receiver android:name=".AlarmReceiver"/>

創建AlarmReceiver類

package (your package)

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    Toast.makeText(context, "Alarm time reached", Toast.LENGTH_SHORT).show();
    Intent i = new Intent();
    i.setClassName("(your package name)", "(your package name.SecondActivity)");
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);
    }
}

在您的FirstActivity的onCreate方法中：

Button mButton = (Button)findViewById(R.id.TestButton);
    final EditText mEditText = (EditText)findViewById(R.id.TestTextBox);
    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int time = Integer.parseInt(mEditText.getText().toString());
            if(time > 0) {
                Intent myIntent = new Intent(getBaseContext(), AlarmReceiver.class);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), 0, myIntent, 0);
                AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
                Calendar calendar = Calendar.getInstance();
                calendar.setTimeInMillis(System.currentTimeMillis());
                calendar.add(Calendar.SECOND, time);
                alarmManager.set(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(), pendingIntent);
                Toast.makeText(getApplicationContext(), "Starting Activity in: " + time + " seconds", Toast.LENGTH_SHORT).show();
                finish();
            }
        }
    });

希望這可以幫助你 ;）

PS：關於在活動之間傳遞圖像，您可以嘗試以下操作：首先在活動頂部聲明位圖：

private Intent myIntent;

將以下代碼添加到FirstActivity中的onCreate方法中

myIntent = new Intent(FirstActivity.this, AlarmReceiver.class);

並在下面添加bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(), bitmapOptions); 下列：

ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
myIntent.putExtra("SendImage", byteArray);

並在下面添加Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));

ByteArrayOutputStream stream = new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
myIntent.putExtra("SendImage", byteArray);

然后在您的AlarmReceiver中

byte[] mByteArray = intent.getByteArrayExtra("SendImage")  //above Intent i = new Intent();
i.putExtra("Image", mByteArray); //above context.startActivity(i);

並在您的SecondActivity中

byte[] mByteArray= getIntent().getByteArrayExtra("Image");
if(mByteArray != null){
    Bitmap mBitmap = BitmapFactory.decodeByteArray(mByteArray, 0, mByteArray.length);
    mTestImage.setImageBitmap(mBitmap); //Your imageview
}

不要以為這是最好的解決方案，但是我已經對此進行了測試，並且效果很好；）