Question

我有一个scrollView，它会逐行列出程序的状态（onCreate，onPause，onResume等）。每次状态发生变化时都会发生什么，TextView的内容只是被覆盖而不是换行。

我已经尝试了几种方法，但我真的不确定它有什么问题。

这是我的java代码::

int numc= 0;
int nums= 0;
int numr= 0;
int nump= 0;
int numst=0;
int numd= 0;

TextView numCreate;
TextView numStart;
TextView numResume;
TextView numPause;
TextView numStop;
TextView numDestroy;

TextView tCreate;
TextView tStart;
TextView tResume;
TextView tPause;
TextView tStop;
TextView tDestroy;

LinearLayout linear;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lifecycle);

    numc++;
    Log.d("STATE", "onCreate executed");
    displayCount();

    linear= findViewById(R.id.linearLay);
    TextView t1= new TextView(this);
    t1.setText("onCreate executed");
    linear.addView(t1);
}

@Override
public void onResume() {
    super.onResume();
    setContentView(R.layout.activity_lifecycle);

    numr++;
    Log.d("STATE", "onRes executed" + numr);
    displayCount();

    linear=findViewById(R.id.linearLay);
    TextView t2= new TextView(this);
    linear.addView(t2);
    t2.setText("onResume executed");
}    
@Override
public void onPause() {
    super.onPause();
    setContentView(R.layout.activity_lifecycle);

    nump++;
    Log.d("STATE", "onPause executed" + nump);
    displayCount();

    linear=findViewById(R.id.linearLay);
    TextView t3= new TextView(this);
    linear.addView(t3);
    t3.setText("onPause executed");
    Log.d("INCREMENT", String.valueOf(linear.getChildCount()));
}

Answer 1

AS PER MY ABOVE COMMENT

试试这个

从setContentView(R.layout.activity_lifecycle); onResume()

移除onPause()

示例代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lifecycle);

    numc++;
    Log.d("STATE", "onCreate executed");
    displayCount();


    TextView t1= new TextView(this);
    t1.setText("onCreate executed");
    linear.addView(t1);
}

@Override
public void onResume() {
    super.onResume();


    numr++;
    Log.d("STATE", "onRes executed" + numr);
    displayCount();


    TextView t2= new TextView(this);
    linear.addView(t2);
    t2.setText("onResume executed");
}    
@Override
public void onPause() {
    super.onPause();


    nump++;
    Log.d("STATE", "onPause executed" + nump);
    displayCount();


    TextView t3= new TextView(this);
    linear.addView(t3);
    t3.setText("onPause executed");
    Log.d("INCREMENT", String.valueOf(linear.getChildCount()));

}

Answer 2

您应该从setContentView(R.layout.activity_lifecycle);和onResume()移除onPause()。

Answer 3

在为TextView设置文字时，请使用"\n，例如 t1.setText("onCreate executed"+ "\n");

Answer 4

从暂停事件中删除setContentView，您可以在LinearLayout

中添加像这样的Textview

TextView htext =new TextView(this);
 textView.setText("Any Text");
 textView.setId(123);
 textView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT));

然后

 linearlayout.addView(textView);

Answer 5

你不需要使用setContentView（）在每种方法中都足以在onCreate中使用它，这个函数会将你的XML膨胀到屏幕

并且足以在findViewById（）中声明一个视图，只需在创建时执行

试试这个

实施例

public class MainActivity extends AppCompatActivity {
LinearLayout linear;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    linear = findViewById(R.id.liner);
    textView = new TextView(this);
    textView.setText("onCreate executed");
    linear.addView(textView);
}

@Override
public void onResume() {
    super.onResume();
    textView = new TextView(this);
    textView.setText("onResume executed");
    linear.addView(textView);
}

@Override
public void onPause() {
    super.onPause();
    textView  = new TextView(this);
    textView.setText("onPause executed");
    linear.addView(textView);
   }
}

将TextView添加到LinearLayout不起作用

5 个答案:

实施例