LayoutInflater 有三種實現方法

1?LayoutInflater inflater = LayoutInflater.from(context) 這種方法常用在彈框?

2?LayoutInflater inflater = getLayoutInflater(); 這樣方法自己用在Fragment 以用布局

3?LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)

下面已popwindow 為例來說下3中方法實現

第一種

public class InflateActivity extends AppCompatActivity {PopupWindow popupWindow;LayoutInflater inflater;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.inflate_activity_layout);inflater = LayoutInflater.from(this);findViewById(R.id.txt).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {View view = inflater.inflate(R.layout.bottom__pop_item, null);popupWindow = new PopupWindow(view, FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT, true);popupWindow.setContentView(view);View rootview = LayoutInflater.from(InflateActivity.this).inflate(R.layout.inflate_activity_layout, null);popupWindow.showAtLocation(rootview, Gravity.BOTTOM, 0, 0);}});}
}

不過一般都不是這樣寫的太麻煩了一般都是直接寫在一起的如下

public class InflateActivity extends AppCompatActivity {PopupWindow popupWindow;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.inflate_activity_layout);findViewById(R.id.txt).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {View view = LayoutInflater.from(InflateActivity.this).inflate(R.layout.bottom__pop_item, null);popupWindow = new PopupWindow(view, FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT, true);popupWindow.setContentView(view);View rootview = LayoutInflater.from(InflateActivity.this).inflate(R.layout.inflate_activity_layout, null);popupWindow.showAtLocation(rootview, Gravity.BOTTOM, 0, 0);}});}
}

第二種方法實現

public class InflateActivity extends AppCompatActivity {PopupWindow popupWindow;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.inflate_activity_layout);findViewById(R.id.txt).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {View view = getLayoutInflater().inflate(R.layout.bottom__pop_item, null);popupWindow = new PopupWindow(view, FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT, true);popupWindow.setContentView(view);View rootview = LayoutInflater.from(InflateActivity.this).inflate(R.layout.inflate_activity_layout, null);popupWindow.showAtLocation(rootview, Gravity.BOTTOM, 0, 0);}});}
}

第三種方法實現

public class InflateActivity extends AppCompatActivity {PopupWindow popupWindow;LayoutInflater inflater;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.inflate_activity_layout);inflater= (LayoutInflater)InflateActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);findViewById(R.id.txt).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {View view = inflater.inflate(R.layout.bottom__pop_item, null);popupWindow = new PopupWindow(view, FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.WRAP_CONTENT, true);popupWindow.setContentView(view);View rootview = LayoutInflater.from(InflateActivity.this).inflate(R.layout.inflate_activity_layout, null);popupWindow.showAtLocation(rootview, Gravity.BOTTOM, 0, 0);}});}
}

簡單的會使用了在看看inflate 方法

當插入的是一個整體布局，比如彈框之類的

public View inflate(@LayoutRes int resource, @Nullable ViewGroup root) {return inflate(resource, root, root != null);
}

resource 是布局，布局是一個整體，所以呢root 我們填寫為null

假如現在要一個布局里面插入另外一個布局 類似下面的

public class InflateActivity extends AppCompatActivity {private LinearLayout cons;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.inflate_activity_layout);cons = findViewById(R.id.cons);getLayoutInflater().inflate(R.layout.inflate_one_layout,cons,true);
}}

這個時候就是使用到了

public View inflate(@LayoutRes int resource, @Nullable ViewGroup root, boolean attachToRoot)

這個root 就是父布局 ，attachToRoot 是，當講view 添加到父布局中的時候設置為true ，當不想添加如果已經添加過了

設置為false ，，，那使用fragment 的時候為啥設置了false ，這個是因為fragment 里面有個什么方法會自動添加?

如果設置為true ，就是添加了2次 所以會報錯

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